A385954 a(0) = 1; a(n) = Sum_{k=0..n-1} binomial(k+5,5) * a(k) * a(n-1-k).

1, 1, 7, 160, 9309, 1193192, 303192604, 140697031749, 111717191583621, 144005113804578040, 288587523313304535136, 867207126292422956078756, 3789698359352103250842742098, 23458242467926487526255374709015, 201037179886862036121457727887328687

Offset

0,3

Links

Table of n, a(n) for n=0..14.

Formula

G.f. A(x) satisfies A(x) = 1/( 1 - Sum_{k=0..5} binomial(5,k) * x^(k+1)/k! * (d^k/dx^k A(x)) ), where (d^0/dx^0 A(x)) = A(x) by convention.

Prog

(PARI) a_vector(n) = my(v=vector(n+1)); v[1]=1; for(i=1, n, v[i+1]=sum(j=0, i-1, binomial(j+5, 5)*v[j+1]*v[i-j])); v;

Crossrefs

Cf. A088716, A351798, A385952, A385953, A385955.

Cf. A385947.

Sequence in context: A137995 A177779 A177469 * A121786 A316947 A083153

Adjacent sequences: A385951 A385952 A385953 * A385955 A385956 A385957

Keyword

nonn

Author

Seiichi Manyama, Jul 13 2025

Status

approved