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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: A064239 A047898 A337042 * 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 September 26 13:34 EDT 2021. Contains 347668 sequences. (Running on oeis4.)