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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
OFFSET
0,2
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 * A348457 A356600 A354340
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Aug 05 2000
EXTENSIONS
More terms from Wouter Meeussen, Aug 05 2000
STATUS
approved