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 A152621 #13 Jan 03 2024 08:46:08
%S A152621 1,2,10,68,484,3464,24808,177680,1272592,9114656,65281696,467565632,
%T A152621 3348834880,23985285248,171789272704,1230402470144,8812484124928,
%U A152621 63117458178560,452064760678912,3237813336359936,23190118126806016
%N A152621 a(n)=8*a(n-1)-6*a(n-2), n>1 ; a(0)=1, a(1)=2.
%C A152621 Unsigned version of A152620.
%H A152621 Harvey P. Dale, <a href="/A152621/b152621.txt">Table of n, a(n) for n = 0..1000</a>
%H A152621 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (8,-6)
%F A152621 G.f.: (1-6*x)/(1-8*x+6*x^2).
%t A152621 LinearRecurrence[{8,-6},{1,2},30] (* _Harvey P. Dale_, Jun 19 2022 *)
%K A152621 nonn,easy
%O A152621 0,2
%A A152621 _Philippe Deléham_, Dec 10 2008