The vertices of a convex polygon with $n\geqslant 4$ sides are coloured with black and white. A diagonal is called [i]multicoloured[/i] if its vertices have different colours. A colouring of the vertices is [i]good[/i] if the polygon can be partitioned into triangles by using only multicoloured diagonals which do not intersect in the interior of the polygon. Find the number of good colourings. 

[i]Proposed by S. Berlov[/i]
1. **Base Case:**
   For \( n = 4 \), consider a quadrilateral. The vertices can be colored in such a way that all black vertices are neighbors and all white vertices are neighbors. This can be done in the following ways:
   - \( BBWW \)
   - \( BWBW \)
   - \( WBWB \)
   - \( WWBB \)

   However, only the configurations \( BBWW \) and \( WWBB \) allow for a partition into triangles using only multicolored diagonals. This is because the diagonals in these configurations will always connect vertices of different colors.

2. **Inductive Step:**
   Assume that for a polygon with \( k \) vertices, the coloring is good if and only if it looks like \( b, b, b, \ldots, b, w, w, w, \ldots, w \), where all black vertices are neighbors and all white vertices are neighbors.

   Now consider a polygon with \( k+1 \) vertices. We need to show that the same pattern holds. If we add one more vertex to the polygon, it can either be black or white. If it is black, it should be adjacent to the existing black vertices to maintain the pattern. Similarly, if it is white, it should be adjacent to the existing white vertices.

   This ensures that the new vertex does not disrupt the existing pattern and that the polygon can still be partitioned into triangles using only multicolored diagonals.

3. **Counting Good Colorings:**
   For a polygon with \( n \) vertices, we need to count the number of ways to color the vertices such that all black vertices are neighbors and all white vertices are neighbors. 

   - There can be \( 1, 2, \ldots, n-1 \) white vertices.
   - For each choice of the number of white vertices, there are \( n \) possible rotations of the polygon.

   Therefore, the total number of good colorings is:
   \[
   n \times (n-1)
   \]

The final answer is \( \boxed{ n(n-1) } \).