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Search: id:A002793
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| A002793 |
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a(n)=2n*a(n-1)-(n-1)^2*a(n-2).
(Formerly M3567 N1446)
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+0
2
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| 0, 1, 4, 20, 124, 920, 7940, 78040, 859580, 10477880, 139931620, 2030707640, 31805257340, 534514790680, 9591325648580, 182974870484120, 3697147584561340, 78861451031150840
(list; graph; listen)
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OFFSET
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0,3
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
J. Ser, Les Calculs Formels des S\'{e}ries de Factorielles. Gauthier-Villars, Paris, 1933, p. 78.
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CROSSREFS
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Bisection of A056952.
Sequence in context: A121553 A067116 A067121 this_sequence A162509 A151341 A135886
Adjacent sequences: A002790 A002791 A002792 this_sequence A002794 A002795 A002796
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Robert G. Wilson v (rgwv(AT)rgwv.com)
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