21075947

Properties

Appears in sequences

• a(n) = Sum_{k=0..floor(n/6)} binomial(n-3k,3k).at n=38A100134
• p-INVERT of (0,1,0,1,0,1,...), where p(S) = 1 - S^3.at n=38A291217
• Expansion of (1 + x)^2/(1 - x^3*(1 + x)^3).at n=36A375321
• a(n) = Sum_{k=0..floor(n/3)} binomial(2*n-3*k,3*k).at n=19A392402
• Prime numbersat n=1334487