A136472 - OEIS

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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

(list; graph; refs; listen; history; text; internal format)

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