A246382 Column 0 of triangular matrix A246381 = exp(L) where L(n,k) = C(2*n, 2*k+1)/2.

1, 1, 3, 12, 73, 584, 5889, 73184, 1089057, 19019632, 384301729, 8870379064, 231356923985, 6757908117208, 219384432585553, 7861969355896416, 309183385066009665, 13273824175564131424, 619230263962630471745, 31258573195774440816360, 1701019508896703563600241, 99446312062485160435840776

Offset

0,3

Links

Table of n, a(n) for n=0..21.

Prog

 (PARI) {a(n)=local(L=matrix(n+1, n+1, r, c, if(r>=c, binomial(2*r-2, 2*c-1)/2)), A);
A=sum(m=0, n, L^m/m!); A[n+1, 1]}
for(n=0, 25, print1(a(n), ", "))

Crossrefs

Cf. A246381, A246383, A246384, A246385.

Sequence in context: A275385 A247055 A163860 * A104028 A074510 A317184

Adjacent sequences: A246379 A246380 A246381 * A246383 A246384 A246385

Keyword

nonn

Author

Paul D. Hanna, Aug 24 2014

Status

approved