A017178 a(n) = (9*n + 1)^6.

1, 1000000, 47045881, 481890304, 2565726409, 9474296896, 27680640625, 68719476736, 151334226289, 304006671424, 567869252041, 1000000000000, 1677100110841, 2699554153024, 4195872914689, 6327518887936, 9294114390625, 13339032325696, 18755369578009, 25892303048704

Offset

0,2

Links

Paolo Xausa, Table of n, a(n) for n = 0..60

Index entries for linear recurrences with constant coefficients, signature (7,-21,35,-35,21,-7,1).

Formula

G.f.: ( -1-999993*x-40045902*x^2 -173569102*x^3 -145457817*x^4 -22302561*x^5 -262144*x^6 ) / (x-1)^7 . - R. J. Mathar, Jul 14 2016

Mathematica

(9*Range[0, 20] + 1)^6 (* Paolo Xausa, Dec 01 2025 *)

Crossrefs

Sequence in context: A289140 A033426 A277400 * A017274 A017514 A017646

Adjacent sequences: A017175 A017176 A017177 * A017179 A017180 A017181

Keyword

nonn,easy

Author

N. J. A. Sloane

Extensions

More terms from Paolo Xausa, Dec 01 2025

Status

approved