A127229 a(n) = numerator of ((n + 5)! - (n - 5)!)/n!.

3628799, 39916799, 239500799, 1037836799, 3632428799, 10897286399, 29059430399, 70572902399, 158789030399, 335221286399, 670442572799, 1279935820799, 2346549004799, 4151586700799, 7117005772799, 11861676287999, 19275223967999, 30613591007999, 47621141567999

Offset

5,1

Links

T. D. Noe, Table of n, a(n) for n = 5..1000

Formula

a(n) = (n + 5)! / (n - 5)! - 1. - Zhuorui He, Feb 08 2026

Mathematica

Table[Numerator[((n + 5)! - (n - 5)!)/(n!)], {n, 5, 30}]

Crossrefs

Cf. A028387, A052787 (denominators), A062938, A127227, A127228, A127230.

Sequence in context: A235970 A116221 A118813 * A269128 A068158 A011521

Adjacent sequences: A127226 A127227 A127228 * A127230 A127231 A127232

Keyword

nonn,frac,easy

Author

Artur Jasinski, Jan 09 2007

Status

approved