-18176

Appears in sequences

• Expansion of (1-x)/(1+2*x^2+2*x^3).at n=21A078037
• Triangle T(n,k) = (1-k*(k-1))*A053120(n,k), read by rows, 0<=k<=n.at n=54A137448
• a(n) = Sum_{k=0..floor(n/4)} binomial(n-k, 3k)*(-3)^(3k)*4^(n-4k).at n=7A248089