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A224800 Column 0 of triangle A224798. 4
1, 1, 4, 24, 224, 3200, 70144, 2394112, 127279104, 10863804416, 1461901721600, 329015240425472, 116091248328048640, 72663237440661618688, 68393195123465340846080, 125216718860772304085843968, 312478055025316083026815352832 (list; graph; refs; listen; history; text; internal format)
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 * A234012 A244760 A240403

Adjacent sequences:  A224797 A224798 A224799 * A224801 A224802 A224803

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Apr 22 2013

STATUS

approved

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Last modified February 22 08:29 EST 2020. Contains 332118 sequences. (Running on oeis4.)