A016924 - OEIS

A016924

a(n) = (6*n + 1)^4.

1, 2401, 28561, 130321, 390625, 923521, 1874161, 3418801, 5764801, 9150625, 13845841, 20151121, 28398241, 38950081, 52200625, 68574961, 88529281, 112550881, 141158161, 174900625, 214358881, 260144641, 312900721, 373301041, 442050625, 519885601, 607573201, 705911761

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OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..2000

Index entries for linear recurrences with constant coefficients, signature (5,-10,10,-5,1).

FORMULA

From Amiram Eldar, Mar 28 2022: (Start)

a(n) = A016921(n)^4 = A016922(n)^2.

Sum_{n>=0} 1/a(n) = PolyGamma(3, 1/6)/7776. (End)

MATHEMATICA

(6Range[0, 30]+1)^4 (* Harvey P. Dale, May 18 2011 *)