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Search: id:A092399
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| A092399 |
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Smarandacheials for k=5. |
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+0
9
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| -24, -42, 336, 216, 2500, 2376, 4032, -52416, -33264, -562500, -532224, -891072, 16039296
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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A generalization of quintuple factorials: back and forth (1972).
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REFERENCES
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J. Dezert, editor, Smarandacheials, Mathematics Magazine, Aurora, Canada, No. 4/2004 (to appear).
F. Smarandache, Back and Forth Factorials, Arizona State Univ., Special Collections, 1972.
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LINKS
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J. Dezert, Smarandacheials
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FORMULA
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a(n) = !n!_5 = Prod_{i=0, 1, 2, ... .}_{0<|n-5i|<=n}(n-5i) = n(n-5)(n-10)....
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EXAMPLE
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!11!_5 = 11(11-5)(11-10)(11-15)(11-20) = 11(6)(1)(-4)(-9) = 2376.
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CROSSREFS
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Sequence in context: A043234 A044014 A087093 this_sequence A118299 A072096 A055480
Adjacent sequences: A092396 A092397 A092398 this_sequence A092400 A092401 A092402
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KEYWORD
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sign
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AUTHOR
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J. Dezert (Jean.Dezert(AT)onera.fr), Mar 21 2004
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