A136469 - OEIS

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A136469

Column 2 of triangle A136467 (scaled): a(n) = A136467(n+2,2)/4^n.

1, 4, 36, 972, 82692, 22668224, 20480767016, 62399482333360, 654732295896172624, 24092174555680443592896, 3156168229958886081384337440, 1490220874303979634022445823087616 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	PROG	`(PARI) {a(n)=local(M=matrix(n+3, n+3, r, c, binomial(r2^(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 A173212 A143764` `Adjacent sequences: A136466 A136467 A136468 * A136470 A136471 A136472`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Dec 31 2007`

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Last modified February 14 07:58 EST 2012. Contains 205604 sequences.