A224799 Column 0 of the matrix square of triangle A224798.

1, 2, 10, 72, 768, 12288, 299008, 11255808, 664469504, 62483333120, 9489129406464, 2346169518784512, 965147017850388480, 649688423266242265088, 756273236725760736100352, 1402615188204296734861426688, 4805236684377633046446974435328

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