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A100645
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Numerator of Cotesian number C(n,2).
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0
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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; refs; listen; history; internal format)
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OFFSET
| 2,2
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REFERENCES
| Charles Jordan, Calculus of Finite Differences, Chelsea 1965, p. 513.
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EXAMPLE
| 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
| See A002176 for further references. A diagonal of A100640/A100641.
Sequence in context: A105525 A165714 A090883 * A132960 A009574 A059422
Adjacent sequences: A100642 A100643 A100644 * A100646 A100647 A100648
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KEYWORD
| sign,frac
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Dec 05 2004
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