A006989 - OEIS

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A006989

Log of g.f. of numbers of preferential arrangements.

1, 0, 2, 4, 34, 196, 1826, 17172, 199074, 2510116, 35862562, 559572916, 9577862306, 177417693636, 3546104002338, 75961485384532, 1737273637523362, 42235881659123812, 1087865420946370082, 29589907884231535860 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	COMMENTS	`If A= e.g.f. for A006989 and B = e.g.f. for A000670, then A = log(1+\int(B))'.`
	PROG	`(PARI) a(n)=if(n<0, 0, n!polcoeff(log(1+intformal(1/(2-exp(x+xO(x^n)))))', n))`
	CROSSREFS	`Cf. A000670.` `Sequence in context: A099433 A051225 A103625 * A132529 A140984 A057996` `Adjacent sequences: A006986 A006987 A006988 * A006990 A006991 A006992`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 15 07:14 EST 2012. Contains 205699 sequences.