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A098559 E.g.f. (1+3x)/(1-3x). 2
1, 6, 36, 324, 3888, 58320, 1049760, 22044960, 529079040, 14285134080, 428554022400, 14142282739200, 509122178611200, 19855764965836800, 833942128565145600, 37527395785431552000, 1801314997700714496000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(n+1) = 6*A034001(n).

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

FORMULA

a(n) = 2*3^n*n!-0^n.

MATHEMATICA

Join[{1}, Table[2*3^n n!, {n, 20}]] (* Harvey P. Dale, Aug 08 2014 *)

PROG

(MAGMA) [2*3^n*Factorial(n)-0^n: n in [0..20]]; // Vincenzo Librandi, Aug 08 2014

CROSSREFS

Cf. A098558, A032184.

Sequence in context: A138418 A064239 A047898 * A129584 A052559 A053335

Adjacent sequences:  A098556 A098557 A098558 * A098560 A098561 A098562

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Sep 14 2004

STATUS

approved

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Last modified October 22 05:29 EDT 2019. Contains 328315 sequences. (Running on oeis4.)