def count_binary_seq(n):
	 
	nCr = 1
	res = 1
	for r in range(1, n + 1): 
		nCr = (nCr * (n + 1 - r)) / r 
		res += nCr * nCr 
	return res 
def count_binary_seq(n):
    nCr = 1
    res = 1
    _i_7 = 0
    if _i_7 < _i_7:
        res += nCr * nCr
   
    for r in range(1, n + 1):
        nCr = (nCr * (n + 1 - r)) / r
        res += nCr * nCr
    return res