A026326 Expansion of 1/((1-2*x)*(1-6*x)*(1-7*x)*(1-9*x)).

1, 24, 373, 4776, 54853, 588408, 6028741, 59809992, 579668485, 5521782552, 51920105029, 483393574248, 4466595742597, 41031327740856, 375223258308037, 3419303762715144, 31074026594864389, 281793678455877720

Offset

0,2

Links

Table of n, a(n) for n=0..17.

Index entries for linear recurrences with constant coefficients, signature (24,-203,696,-756).

Formula

a(n) = -2*2^n/35 +18*6^n -343*7^n/10 +243*9^n/14. - R. J. Mathar, Jun 23 2013

E.g.f.: exp(2*x)*(1215*exp(7*x) - 2401*exp(5*x) + 1260*exp(4*x) - 4)/70. - Stefano Spezia, Dec 20 2025

Crossrefs

Sequence in context: A168304 A053062 A028060 * A028043 A028056 A025997

Adjacent sequences: A026323 A026324 A026325 * A026327 A026328 A026329

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved