

A100644


Denominator of Cotesian number C(n,1).


0



2, 3, 8, 45, 96, 35, 17280, 14175, 89600, 149688, 29030400, 79625, 402361344000, 312741000, 229605376, 488462349375, 83691159552000, 50697046400, 8604790260498432, 1470076286679, 29967718809600000, 4694524604733600000, 269760174666625843200000, 5699209469078125
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OFFSET

1,1


REFERENCES

Charles Jordan, Calculus of Finite Differences, Chelsea 1965, p. 513.


LINKS

Table of n, a(n) for n=1..24.


EXAMPLE

1/2, 2/3, 3/8, 16/45, 25/96, 9/35, 3577/17280, 2944/14175, 15741/89600, 26575/149688, 4495513/29030400, 12504/79625, 56280729661/402361344000, 44436679/312741000, ... = A100623/A100624 = A002178/A002176 (the latter not being in lowest terms)


CROSSREFS

See A002176 for further references. A diagonal of A100640/A100641.
Sequence in context: A042553 A042139 A118127 * A013208 A094370 A066084
Adjacent sequences: A100641 A100642 A100643 * A100645 A100646 A100647


KEYWORD

nonn,frac


AUTHOR

N. J. A. Sloane, Dec 04 2004


STATUS

approved



