63844

Appears in sequences

• a(n) = Sum_{k=0..n} binomial(n, k)^2 * hypergeom([(k-n)/2, (k-n+1)/2], [k+2], 4).at n=8A344502
• Expansion of Sum_{k>=0} (k * x * (1 + x))^k.at n=6A360611