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 A074601 #27 Sep 08 2022 08:45:07
%S A074601 2,8,40,224,1312,7808,46720,280064,1679872,10078208,60467200,
%T A074601 362799104,2176786432,13060702208,78364180480,470185017344,
%U A074601 2821109972992,16926659575808,101559956930560,609359740534784,3656158441111552
%N A074601 a(n) = 2^n + 6^n.
%H A074601 Vincenzo Librandi, <a href="/A074601/b074601.txt">Table of n, a(n) for n = 0..200</a>
%H A074601 Wei Chen, <a href="http://summit.sfu.ca/item/14626">Enumeration of Set Partitions Refined by Crossing and Nesting Numbers</a>, MS Thesis, Department of Mathematics. Simon Fraser University, Fall 2014. Table 5.2, r=2.
%H A074601 Takao Komatsu, <a href="https://arxiv.org/abs/2105.08277">Asymmetric Circular Graph with Hosoya Index and Negative Continued Fractions</a>, arXiv:2105.08277 [math.CO], 2021.
%H A074601 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (8,-12).
%F A074601 a(n) = 6*a(n-1) - 2^n = 8*a(n-1) - 12*a(n-2).
%F A074601 From _Mohammad K. Azarian_, Jan 02 2009: (Start)
%F A074601 G.f.: 1/(1-2*x) + 1/(1-6*x).
%F A074601 E.g.f.: e^(2*x) + e^(6*x). (End)
%t A074601 Table[2^n + 6^n, {n, 0, 22}]
%o A074601 (Magma) [2^n + 6^n: n in [0..35]]; // _Vincenzo Librandi_, Apr 30 2011
%Y A074601 Cf. A000051, A034472, A052539, A034474, A062394, A034491, A062395, A062396, A007689, A063376, A063481, A074600 - A074624.
%K A074601 easy,nonn
%O A074601 0,1
%A A074601 _Robert G. Wilson v_, Aug 25 2002