28113228

Appears in sequences

• a(n) = sum of numbers which in base 2 contain exactly n digits 1 and not more than n digits 0.at n=7A131568
• T(n, k) = [x^k] (1/2 - x)^(-n) - (1 - x)^(-n).at n=35A356117
• T(n, k) = [x^k] (1/2 - x)^(-n) - (1 - x)^(-n).at n=42A356117