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Search: id:A001565
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| A001565 |
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3rd differences of factorial numbers.
(Formerly M2004 N0793)
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+0
9
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| 2, 11, 64, 426, 3216, 27240, 256320, 2656080, 30078720, 369774720, 4906137600, 69894316800, 1064341555200, 17255074636800, 296754903244800, 5396772116736000, 103484118786048000, 2086818140639232000, 44150769074700288000, 977904962186600448000
(list; graph; listen)
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OFFSET
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0,1
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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).
A. van Heemert, Cyclic permutations with sequences and related problems, J. Reine Angew. Math., 198 (1957), 56-72.
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LINKS
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Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets
Index entries for sequences related to factorial numbers
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FORMULA
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a(n) = (n^3 + 3n^2 + 5n + 2)*n! - Mitch Harris (maharri(AT)gmail.com), Jul 10 2008
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CROSSREFS
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Cf. A047920.
Sequence in context: A126745 A038725 A161947 this_sequence A074613 A039632 A143816
Adjacent sequences: A001562 A001563 A001564 this_sequence A001566 A001567 A001568
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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