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 A056197 Diagonal of A056151. 1
 1, 7, 38, 222, 1464, 10920, 91440, 851760, 8749440, 98340480, 1201132800, 15846969600, 224651750400, 3406180377600, 55009501747200, 942833219328000, 17093919338496000, 326876746420224000, 6575237795782656000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS FORMULA a(n)=(3n^2+3n+1)n!=((n+1)^3-n^3)n!=n!A003215(n). - Paul Barry, Apr 02 2003 E.g.f.: (1 + 4*x + x^2)/(1 - x)^3. - Ilya Gutkovskiy, May 12 2017 MATHEMATICA Table[(3n(n+1)+1)n!, {n, 0, 18}] CROSSREFS Cf. A056151. Sequence in context: A027241 A292761 A226200 * A229126 A158576 A304012 Adjacent sequences:  A056194 A056195 A056196 * A056198 A056199 A056200 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, Aug 05 2000 EXTENSIONS More terms from Wouter Meeussen, Aug 05 2000 STATUS approved

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Last modified April 21 06:10 EDT 2021. Contains 343146 sequences. (Running on oeis4.)