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A136469 Column 2 of triangle A136467 (scaled): a(n) = A136467(n+2,2)/4^n. 2
1, 4, 36, 972, 82692, 22668224, 20480767016, 62399482333360, 654732295896172624, 24092174555680443592896, 3156168229958886081384337440, 1490220874303979634022445823087616 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

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

CROSSREFS

Cf. A136467; A136468.

Sequence in context: A134052 A127901 A061742 * A120605 A337851 A173212

Adjacent sequences:  A136466 A136467 A136468 * A136470 A136471 A136472

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Dec 31 2007

STATUS

approved

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Last modified July 29 22:26 EDT 2021. Contains 346346 sequences. (Running on oeis4.)