human
N | Function to return the decimal value of a binary number.
Initializing base value to 1 , i . e 2 ^ 0.
find the binary representation of the N - th number in sequence.
base case.
answer string.
add n - 1 1 's.
add 0.
add n 1 's at end.
Driver Code"
How can the above be solved in Python?
assistant
#Here is code to n and the other steps required.
 def binaryToDecimal ( n ) :
	num = n
	dec_value = 0
	base = 1
	l = len ( num )
	for i in range ( l - 1 , - 1 , - 1 ) :
		if ( num [ i ] == '1' ) :
			dec_value += base
		base = base * 2
	return dec_value
def numberSequence ( n ) :
	if ( n == 1 ) :
		return 1
	s = " "
	for i in range ( 1 , n ) :
		s += '1'
	s += '0'
	for i in range ( 1 , n + 1 ) :
		s += '1'
	num = binaryToDecimal ( s )
	return num
if __name__ == " _ _ main _ _ " :
	n = 4
	print ( numberSequence ( n ) )