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Search: id:A100645
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| A100645 |
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Numerator of Cotesian number C(n,2). |
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+0
1
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| 1, 3, 2, 25, 9, 49, -464, 27, -16175, -3237113, -105387, -1737125143, -770720657, -25881785, -1997012608, -135505859252213, -214182958293, -528114253960241, -19467909708875, -595278405326437, -66462260889140083, -180690496141440384775397, -1610254561193224
(list; graph; listen)
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OFFSET
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2,2
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REFERENCES
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Charles Jordan, Calculus of Finite Differences, Chelsea 1965, p. 513.
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EXAMPLE
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1/6, 3/8, 2/15, 25/144, 9/280, 49/640, -464/14175, 27/2240, -16175/199584, -3237113/87091200, -105387/875875, -1737125143/22353408000, -770720657/5003856000, -25881785/229605376, ... = A100625/A100626 = A002179/A002176 (the latter not being in lowest terms)
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CROSSREFS
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See A002176 for further references. A diagonal of A100640/A100641.
Sequence in context: A105525 A165714 A090883 this_sequence A132960 A009574 A059422
Adjacent sequences: A100642 A100643 A100644 this_sequence A100646 A100647 A100648
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KEYWORD
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sign,frac
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Dec 05 2004
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