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 A074530 #18 Aug 04 2025 16:46:26
%S A074530 3,13,77,547,4193,33043,262937,2099467,16784033,134237923,1073801897,
%T A074530 8590113787,68720012273,549757416403,4398051310457,35184386470507,
%U A074530 281475019822913,2251799942956483,18014398897164617,144115189238641627
%N A074530 a(n) = 2^n + 3^n + 8^n.
%H A074530 Vincenzo Librandi, <a href="/A074530/b074530.txt">Table of n, a(n) for n = 0..200</a>
%H A074530 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (13,-46,48).
%F A074530 From _Mohammad K. Azarian_, Dec 27 2008: (Start)
%F A074530 G.f.: 1/(1-2*x) + 1/(1-3*x) + 1/(1-8*x).
%F A074530 E.g.f.: exp(2*x) + exp(3*x) + exp(8*x). (End)
%t A074530 Table[2^n + 3^n + 8^n, {n, 0, 20}]
%t A074530 LinearRecurrence[{13,-46,48},{3,13,77},20] (* _Harvey P. Dale_, Aug 04 2025 *)
%o A074530 (Magma) [2^n + 3^n + 8^n: n in [0..25]]; // _Vincenzo Librandi_, Jun 11 2011
%Y A074530 Cf. A001550, A001576, A034513, A001579, A074501 - A074580.
%K A074530 easy,nonn
%O A074530 0,1
%A A074530 _Robert G. Wilson v_, Aug 23 2002