login
A224800
Column 0 of triangle A224798.
4
1, 1, 4, 24, 224, 3200, 70144, 2394112, 127279104, 10863804416, 1461901721600, 329015240425472, 116091248328048640, 72663237440661618688, 68393195123465340846080, 125216718860772304085843968, 312478055025316083026815352832
OFFSET
0,3
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
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Apr 22 2013
STATUS
approved