A100647 Numerator of Cotesian number C(n,3).

1, 16, 25, 34, 2989, 5248, 1209, 5675, 560593, 893128, 11148172711, 109420087, 349259195, 83221185536, 17347403755459, 161769065751, 26070191142124243, 4137435748625, 1745702310941533, 1389851895548897, 936428641553074799449741, 748157499921069376

Offset

3,2

References

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

Links

Table of n, a(n) for n=3..24.

Example

1/8, 16/45, 25/144, 34/105, 2989/17280, 5248/14175, 1209/5600, 5675/12474, 560593/1935360, 893128/1576575, 11148172711/28740096000, 109420087/156370500, ... = A100627/A100628

Crossrefs

See A002176 for further references. A diagonal of A100640/A100641.

Sequence in context: A274240 A176512 A001033 * A245371 A235717 A368049

Adjacent sequences: A100644 A100645 A100646 * A100648 A100649 A100650

Keyword

nonn,frac

Author

N. J. A. Sloane, Dec 05 2004

Status

approved