A110043 - OEIS

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A110043

a(1) = 2; for n>1, a(n) = n*a(n-1) + (-1)^n.

2, 5, 14, 57, 284, 1705, 11934, 95473, 859256, 8592561, 94518170, 1134218041, 14744834532, 20642783449, 3096415251734, 49542644027745, 842224948471664, 15160049072489953, 288040932377309106, 5760818647546162121 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`A000166 and A001120 have a similar recurrence.` `a(n) - (n-1)*(a(n-1)+a(n-2)),n>2 [From Gary Detlefs (gdetlefs(AT)aol.com), Apr 11 2010]`
	FORMULA	`a(n) = A001120(n) + n! = A000166(n) + 2n!.` `a(n) = 2n! + floor((n!+1)/e) [From Gary Detlefs (gdetlefs(AT)aol.com), Apr 11 2010]`
	CROSSREFS	`Sequence in context: A047136 A047042 A174795 * A006847 A008286 A049082` `Adjacent sequences: A110040 A110041 A110042 * A110044 A110045 A110046`
	KEYWORD	`nonn,easy`
	AUTHOR	`Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Sep 04 2005`

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Last modified February 13 15:49 EST 2012. Contains 205521 sequences.