
    Write a function to determine how many possible financial behavior patterns exist over two consecutive periods, each of length n months, where the number of positive financial actions (like on-time payments) in the first period equals the number of positive actions in the second period. Each month is represented by either a positive (1) or negative (0) financial action, and the total monitoring period is 2n months.
    

    
def count_binary_seq(n):
    """
    Write a function to determine how many possible financial behavior patterns exist over two consecutive periods, each of length n months, where the number of positive financial actions (like on-time payments) in the first period equals the number of positive actions in the second period. Each month is represented by either a positive (1) or negative (0) financial action, and the total monitoring period is 2n months.
    

    """
def count_binary_seq(n):
    """
    Write a function to determine how many possible financial behavior patterns exist over two consecutive periods, each of length n months, where the number of positive financial actions (like on-time payments) in the first period equals the number of positive actions in the second period. Each month is represented by either a positive (1) or negative (0) financial action, and the total monitoring period is 2n months.
    

    """
    nCr = 1
    res = 1
    for r in range(1, n + 1):
        nCr = nCr * (n + 1 - r) / r
        res += nCr * nCr
    return res