220440

Appears in sequences

• p-INVERT of the positive integers, where p(S) = 1 - 3*S^2.at n=10A290906
• Coefficients of x^(n*(n+2)) in Sum_{n>=0} x^n * (1 + x^n)^n / (1 + x^(n+1))^(n+1).at n=10A323677