292896

Appears in sequences

• a(n) = 5*n^5 - 3*n^3 - 2*n^2.at n=9A134630
• a(n) = Sum_{k=0..floor(n/3)} 2^k * 3^(n-3*k) * binomial(2*k,2*(n-3*k)).at n=20A390619