A100643 Numerator of Cotesian number C(n,1).

1, 2, 3, 16, 25, 9, 3577, 2944, 15741, 26575, 4495513, 12504, 56280729661, 44436679, 29505985, 63813303296, 10004122565473, 6162434073, 965843331633293, 167791152125, 3181977977743649, 506778072148248857, 27256898762578419475451, 585293809045696

Offset

1,2

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: A044905 A045877 A261840 * A067037 A117926 A185251

Adjacent sequences: A100640 A100641 A100642 * A100644 A100645 A100646

Keyword

nonn,frac

Author

N. J. A. Sloane, Dec 04 2004

Status

approved