A136472 Column 2 of triangle A136470 (scaled): a(n) = A136470(n+2,2)/4^n.

1, 8, 136, 6552, 973832, 465833856, 739387804752, 3992649623654752, 74888425049167499424, 4962998789388515787006336, 1178375010889854741001146703936, 1013755301703927988518902015091910656

Offset

0,2

Comments

Triangle T = A136470 is defined by: column 0 of T^m = {C(m*2^n, n), n>=0}.

Links

Table of n, a(n) for n=0..11.

Prog

(PARI) {a(n)=local(M=matrix(n+3, n+3, r, c, binomial(r*2^(c-1), c-1)), P); P=matrix(n+3, n+3, r, c, binomial((r+1)*2^(c-1), c-1)); (P~*M~^-1)[n+3, 3]/4^n}

Crossrefs

Cf. A136470; A136471.

Sequence in context: A049211 A024283 A134053 * A145404 A101388 A281684

Adjacent sequences: A136469 A136470 A136471 * A136473 A136474 A136475

Keyword

nonn

Author

Paul D. Hanna, Jan 01 2008

Status

approved