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 A074508 #15 Jan 26 2023 10:05:36
%S A074508 3,10,46,244,1378,8020,47386,282124,1686178,10097380,60525226,
%T A074508 362974204,2177313778,13062288340,78368947066,470199333484,
%U A074508 2821152954178,16926788584900,101560344088906,609360902271964
%N A074508 a(n) = 1^n + 3^n + 6^n.
%H A074508 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (10,-27,18).
%F A074508 G.f.: 1/(1-x)+1/(1-3*x)+1/(1-6*x). E.g.f.: e^x+e^(3*x)+e^(6*x). [_Mohammad K. Azarian_, Dec 26 2008]
%F A074508 a(n) = 9*a(n-1) - 18*a(n-2) + 10, n>1. [_Gary Detlefs_, Jun 21 2010]
%t A074508 Table[1^n + 3^n + 6^n, {n, 0, 20}]
%Y A074508 Cf. A001550, A001576, A034513, A001579, A074501 - A074580.
%K A074508 easy,nonn
%O A074508 0,1
%A A074508 _Robert G. Wilson v_, Aug 23 2002