A246383 Column 1 of triangular matrix A246381 = exp(L) where L(n,k) = C(2*n, 2*k+1)/2.

1, 2, 13, 80, 701, 7680, 100519, 1571040, 28717865, 603257920, 14416329195, 388260739088, 11678958965277, 389482102959488, 14310687493377983, 576066868803187392, 25277071561379201617, 1203584932712027264896, 61941144066758992621267, 3432816764783569537730544

Offset

0,2

Links

Table of n, a(n) for n=0..19.

Prog

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

Crossrefs

Cf. A246381, A246382, A246384, A246385.

Sequence in context: A216316 A000179 A335700 * A189087 A037739 A037634

Adjacent sequences: A246380 A246381 A246382 * A246384 A246385 A246386

Keyword

nonn

Author

Paul D. Hanna, Aug 24 2014

Status

approved