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