Arthur stands on a circle drawn with chalk in a parking lot.  It is sunrise and there are birds in the trees nearby.  He stands on one of five triangular nodes that are spaced equally around the circle, wondering if and when the aliens will pick him up and carry him from the node he is standing on.  He flips a fair coin $12$ times, each time chanting the name of a nearby star system.  Each time he flips a head, he walks around the circle, in the direction he is facing, until he reaches the next node in that direction.  Each time he flips a tail, he reverses direction, then walks around the circle until he reaches the next node in that new direction.  After $12$ flips, Arthur finds himself on the node at which he started.  He thinks this is fate, but Arthur is quite mistaken.  If $a$ and $b$ are relatively prime positive integers such that $a/b$ is the probability that Arthur flipped exactly $6$ heads, find $a+b$.
1. **Understanding the Problem:**
   Arthur flips a fair coin 12 times. Each head (H) moves him one node forward, and each tail (T) reverses his direction and moves him one node backward. After 12 flips, he ends up at the starting node. We need to find the probability that he flipped exactly 6 heads.

2. **Analyzing Movement:**
   Each head (H) moves Arthur one node forward, and each tail (T) reverses his direction and moves him one node backward. Since there are 5 nodes, moving forward or backward 5 times brings him back to the starting node.

3. **Condition for Returning to Start:**
   For Arthur to return to the starting node after 12 flips, the net movement must be a multiple of 5. Let \( H \) be the number of heads and \( T \) be the number of tails. We have:
   \[
   H + T = 12
   \]
   The net movement is given by:
   \[
   H - T \equiv 0 \pmod{5}
   \]
   Substituting \( T = 12 - H \):
   \[
   H - (12 - H) \equiv 0 \pmod{5}
   \]
   Simplifying:
   \[
   2H - 12 \equiv 0 \pmod{5}
   \]
   \[
   2H \equiv 12 \pmod{5}
   \]
   \[
   2H \equiv 2 \pmod{5}
   \]
   \[
   H \equiv 1 \pmod{5}
   \]
   Therefore, \( H \) must be of the form \( 5k + 1 \). Since \( H \) must be an integer between 0 and 12, the possible values for \( H \) are 1, 6, and 11.

4. **Finding the Probability for \( H = 6 \):**
   We need to find the probability that Arthur flipped exactly 6 heads out of 12 flips. The number of ways to choose 6 heads out of 12 flips is given by the binomial coefficient:
   \[
   \binom{12}{6}
   \]
   The probability of getting exactly 6 heads in 12 flips of a fair coin is:
   \[
   P(H = 6) = \binom{12}{6} \left( \frac{1}{2} \right)^{12}
   \]

5. **Calculating the Binomial Coefficient:**
   \[
   \binom{12}{6} = \frac{12!}{6!6!} = 924
   \]

6. **Calculating the Probability:**
   \[
   P(H = 6) = 924 \left( \frac{1}{2} \right)^{12} = \frac{924}{4096}
   \]
   Simplifying the fraction:
   \[
   \frac{924}{4096} = \frac{231}{1024}
   \]

7. **Relatively Prime Check:**
   The fraction \(\frac{231}{1024}\) is in its simplest form since 231 and 1024 have no common factors other than 1.

8. **Finding \( a + b \):**
   Here, \( a = 231 \) and \( b = 1024 \). Therefore:
   \[
   a + b = 231 + 1024 = 1255
   \]

The final answer is \(\boxed{1255}\)