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 A074537 #16 Sep 08 2022 08:45:07
%S A074537 3,13,65,349,1937,10933,62345,358189,2070497,12031333,70232825,
%T A074537 411627229,2420927057,14281405333,84467696105,500702595469,
%U A074537 2973697863617,17689599028933,105374654196185,628433226862909
%N A074537 a(n) = 2^n + 5^n + 6^n.
%H A074537 Vincenzo Librandi, <a href="/A074537/b074537.txt">Table of n, a(n) for n = 0..200</a>
%H A074537 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (13,-52,60).
%F A074537 From _Mohammad K. Azarian_, Dec 27 2008: (Start)
%F A074537 G.f.: 1/(1-2*x) + 1/(1-5*x) + 1/(1-6*x).
%F A074537 E.g.f.: exp(2*x) + exp(5*x) + exp(6*x). (End)
%t A074537 Table[2^n + 5^n + 6^n, {n, 0, 20}]
%o A074537 (Magma) [2^n + 5^n + 6^n: n in [0..25]]; // _Vincenzo Librandi_, Jun 11 2011
%Y A074537 Cf. A001550, A001576, A034513, A001579, A074501 - A074580.
%K A074537 easy,nonn
%O A074537 0,1
%A A074537 _Robert G. Wilson v_, Aug 23 2002