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A224799 Column 0 of the matrix square of triangle A224798. 4
1, 2, 10, 72, 768, 12288, 299008, 11255808, 664469504, 62483333120, 9489129406464, 2346169518784512, 965147017850388480, 649688423266242265088, 756273236725760736100352, 1402615188204296734861426688, 4805236684377633046446974435328 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

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)=local(M=matrix(n+1, n+1, r, c, if(r>=c, A224798(r-1, c-1)))); (M^2)[n+1, 1]}

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

CROSSREFS

Cf. A224798, A224800, A224801, A224802.

Sequence in context: A238085 A277502 A231039 * A275550 A243250 A088189

Adjacent sequences:  A224796 A224797 A224798 * A224800 A224801 A224802

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Apr 22 2013

STATUS

approved

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Last modified July 15 16:09 EDT 2019. Contains 325049 sequences. (Running on oeis4.)