

A165793


a(0)=1, a(n)=n*(a(n1)2).


3



1, 1, 6, 24, 104, 530, 3192, 22358, 178880, 1609938, 16099400, 177093422, 2125121088, 27626574170, 386772038408, 5801580576150, 92825289218432, 1578029916713378, 28404538500840840
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OFFSET

0,3


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 19 2010


MATHEMATICA

RecurrenceTable[{a[0]==1, a[n]==n*(a[n1]2)}, a[n], {n, 30}] (* Harvey P. Dale, Jul 19 2011 *)
FoldList[#1*#2  2 #2 &, 1, Range[25]] (* G. C. Greubel, Apr 08 2016 *)


CROSSREFS

Sequence in context: A120583 A089378 A074414 * A122740 A034432 A026962
Adjacent sequences: A165790 A165791 A165792 * A165794 A165795 A165796


KEYWORD

sign


AUTHOR

Philippe Deléham, Sep 26 2009


EXTENSIONS

Corrected by Harvey P. Dale, Jul 19 2011


STATUS

approved



