A224801 Column 1 of triangle A224798.

1, 2, 8, 64, 768, 15360, 454656, 22528000, 1646198784, 210411192320, 38824724922368, 13515210211983360, 6407999879041253376, 6440118524495448244224, 7853658309291192797364224, 24080596961115387208480587776

Offset

0,2

Links

Table of n, a(n) for n=0..15.

Prog

(PARI) {A224798(n, k)=if(n<k||k<0, 0, if(n==k, 1, if(n==k+1, 2^(n-1), sum(j=k+1, n, A224798(n, j)*A224798(j, k+1) ))))}
{a(n)=A224798(n+1, 1)}
for(n=0, 20, print1(a(n), ", "))

Crossrefs

Cf. A224798, A224799, A224800, A224802.

Sequence in context: A326290 A136282 A092934 * A191571 A347012 A139679

Adjacent sequences: A224798 A224799 A224800 * A224802 A224803 A224804

Keyword

nonn

Author

Paul D. Hanna, Apr 22 2013

Status

approved