A224800 Column 0 of triangle A224798.

1, 1, 4, 24, 224, 3200, 70144, 2394112, 127279104, 10863804416, 1461901721600, 329015240425472, 116091248328048640, 72663237440661618688, 68393195123465340846080, 125216718860772304085843968, 312478055025316083026815352832

Offset

0,3

Links

Table of n, a(n) for n=0..16.

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, 0)}
for(n=0, 16, print1(a(n), ", "))

Crossrefs

Cf. A224798, A224799, A224801, A224802.

Sequence in context: A277612 A216857 A318005 * A348904 A370875 A234012

Adjacent sequences: A224797 A224798 A224799 * A224801 A224802 A224803

Keyword

nonn

Author

Paul D. Hanna, Apr 22 2013

Status

approved