A377745 E.g.f. satisfies A(x) = exp(x) / (1 - x * A(x)^2)^2.
1, 3, 35, 865, 32917, 1699311, 111033607, 8788108477, 817439352233, 87406186549339, 10564550856634411, 1424421297360350169, 211968687043802337469, 34509326697582566247367, 6101526326400539736369935, 1164298084658023787974823221, 238495519792465232104337607505
Offset: 0
Keywords
Programs
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PARI
a(n) = n!*sum(k=0, n, (2*k+1)^(n-k-1)*binomial(5*k+1, k)/(n-k)!);
Formula
a(n) = n! * Sum_{k=0..n} (2*k+1)^(n-k-1) * binomial(5*k+1,k)/(n-k)!.