A105617 - OEIS

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A105617

Column 2 of triangle A105615.

1, 6, 50, 522, 6498, 93666, 1532970, 28079082, 569212578, 12655466946, 306280630890, 8017054975242, 225716319717858, 6802519195684386, 218521006115328810, 7454198349649868202, 269114811307118424738 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,2`
	LINKS	`Table of n, a(n) for n=0..16.`
	PROG	`(PARI) {a(n)=if(n<0, 0, (matrix(n+3, n+3, m, j, if(m>=j, if(m==j, 1, if(m==j+1, -2j, polcoeff(1/sum(i=0, m-j, (2i)!/i!/2^i*x^i)+O(x^m), m-j) ))))^-1)[n+3, 3])}`
	CROSSREFS	`Cf. A105615.` `Sequence in context: A125558 A005416 A300989 * A297926 A094072 A058784` `Adjacent sequences: A105614 A105615 A105616 * A105618 A105619 A105620`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna, Apr 16 2005`
	STATUS	`approved`

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Last modified March 2 19:18 EST 2021. Contains 341756 sequences. (Running on oeis4.)