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A110043 a(1) = 2; for n>1, a(n) = n*a(n-1) + (-1)^n. 1
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; text; 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, Apr 11 2010]

LINKS

Table of n, a(n) for n=1..20.

FORMULA

a(n) = A001120(n) + n! = A000166(n) + 2*n!.

a(n) = 2*n! + floor((n!+1)/e) [From Gary Detlefs, Apr 11 2010]

CROSSREFS

Sequence in context: A047042 A174795 A243551 * A006847 A008286 A049082

Adjacent sequences:  A110040 A110041 A110042 * A110044 A110045 A110046

KEYWORD

nonn,easy

AUTHOR

Philippe Deléham, Sep 04 2005

STATUS

approved

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Last modified March 20 23:22 EDT 2019. Contains 321354 sequences. (Running on oeis4.)