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 A074558 #16 Jan 21 2024 16:50:42
%S A074558 3,18,122,882,6578,49818,380522,2922882,22548578,174591018,1356276122,
%T A074558 10567438482,82561295378,646646418618,5076274366922,39931947947682,
%U A074558 314707950326978,2484430456812618,19642812494812922,155514084423490482
%N A074558 a(n) = 3^n + 7^n + 8^n.
%H A074558 Vincenzo Librandi, <a href="/A074558/b074558.txt">Table of n, a(n) for n = 0..1000</a>
%H A074558 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (18,-101,168).
%F A074558 From _Mohammad K. Azarian_, Dec 30 2008: (Start)
%F A074558 G.f.: 1/(1-3*x) + 1/(1-7*x) + 1/(1-8*x).
%F A074558 E.g.f.: exp(3*x) + exp(7*x) + exp(8*x). (End)
%t A074558 Table[3^n + 7^n + 8^n, {n, 0, 20}]
%t A074558 LinearRecurrence[{18,-101,168},{3,18,122},20] (* _Harvey P. Dale_, Jan 21 2024 *)
%o A074558 (Magma) [3^n + 7^n + 8^n: n in [0..20]]; // _Vincenzo Librandi_, Aug 24 2011
%Y A074558 Cf. A001550, A001576, A034513, A001579, A074501 - A074580.
%K A074558 easy,nonn
%O A074558 0,1
%A A074558 _Robert G. Wilson v_, Aug 23 2002