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A016816

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

1, 625, 6561, 28561, 83521, 194481, 390625, 707281, 1185921, 1874161, 2825761, 4100625, 5764801, 7890481, 10556001, 13845841, 17850625, 22667121, 28398241, 35153041, 43046721, 52200625, 62742241, 74805201, 88529281, 104060401, 121550625, 141158161, 163047361

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..28.

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

FORMULA

Sum_{n>=0} 1/a(n) = A390074/(6*4^4). - R. J. Mathar, Oct 24 2025

MATHEMATICA

Table[(4n+1)^4, {n, 0, 100}] (* Mohammad K. Azarian, Jun 18 2016 *)

LinearRecurrence[{5, -10, 10, -5, 1}, {1, 625, 6561, 28561, 83521}, 30] (* Harvey P. Dale, Apr 01 2019 *)

CROSSREFS