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A090595 Fourth column (k=3) of triangle A084938. 2
1, 3, 9, 31, 126, 606, 3428, 22572, 170856, 1467432, 14123808, 150644448, 1763377344, 22466496960, 309371685120, 4577183527680, 72390548206080, 1218507923427840, 21746087150745600, 410094720409651200 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

3rd column (k=2): A003149.

LINKS

Table of n, a(n) for n=0..19.

FORMULA

a(n) = Sum_{k=0..n} A003149(k)*(n-k)!.

G.f.: (Sum_k>=0} k!*x^k)^3.

CROSSREFS

Sequence in context: A040027 A182968 A071603 * A027040 A111063 A245116

Adjacent sequences:  A090592 A090593 A090594 * A090596 A090597 A090598

KEYWORD

easy,nonn

AUTHOR

Philippe Deléham, Feb 01 2004

STATUS

approved

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Last modified March 20 05:34 EDT 2019. Contains 321344 sequences. (Running on oeis4.)