This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A016816 #15 Jul 08 2025 05:55:27
%S A016816 1,625,6561,28561,83521,194481,390625,707281,1185921,1874161,2825761,
%T A016816 4100625,5764801,7890481,10556001,13845841,17850625,22667121,28398241,
%U A016816 35153041,43046721,52200625,62742241,74805201,88529281,104060401,121550625,141158161,163047361
%N A016816 a(n) = (4n+1)^4.
%H A016816 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (5, -10, 10, -5, 1).
%t A016816 Table[(4n+1)^4,{n,0,100}] (* _Mohammad K. Azarian_, Jun 18 2016 *)
%t A016816 LinearRecurrence[{5,-10,10,-5,1},{1,625,6561,28561,83521},30] (* _Harvey P. Dale_, Apr 01 2019 *)
%K A016816 nonn,easy
%O A016816 0,2
%A A016816 _N. J. A. Sloane_