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A165792 a(0)=1, a(n)=n*(a(n-1)+2). 3
1, 3, 10, 36, 152, 770, 4632, 32438, 259520, 2335698, 23357000, 256927022, 3083124288, 40080615770, 561128620808, 8416929312150, 134670868994432, 2289404772905378, 41209285912296840, 782976432333639998 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..250

FORMULA

a(n) = n! + 2*floor(e*n!)-2, n>0. - Gary Detlefs, Jun 06 2010

MATHEMATICA

FoldList[#1*#2 + 2 #2 &, 1, Range[19]](* Robert G. Wilson v, Jul 07 2012 *)

CROSSREFS

Cf. A000142, A033540.

Sequence in context: A162162 A149042 A081921 * A010373 A322726 A104603

Adjacent sequences:  A165789 A165790 A165791 * A165793 A165794 A165795

KEYWORD

nonn

AUTHOR

Philippe Deléham, Sep 26 2009

EXTENSIONS

Definition corrected by Philippe Deléham, Sep 28 2009

STATUS

approved

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Last modified June 24 17:58 EDT 2019. Contains 324330 sequences. (Running on oeis4.)