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 A147851 #11 Sep 08 2022 08:45:38
%S A147851 1,0,0,2,2,2,3,6,7,10,15,18,27,38,50,66,92,126,165,224,300,400,536,
%T A147851 714,948,1258,1676,2218,2932,3882,5128,6768,8924,11760,15479,20366,
%U A147851 26780,35174,46182,60602,79473,104158,136445,178654,233797,305834,399881
%N A147851 Expansion of 1/(1 - x^3 - x^4 - x^5 + x^8)^2.
%H A147851 G. C. Greubel, <a href="/A147851/b147851.txt">Table of n, a(n) for n = 0..1000</a>
%H A147851 Roger L. Bagula, <a href="/A147851/a147851.txt">Base Polynomial Mathematica Program</a>
%H A147851 Michael Mossinghoff, <a href="http://www.cecm.sfu.ca/~mjm/Lehmer/lists/SalemList.html">Small Salem Numbers</a>
%H A147851 <a href="/index/Rec#order_16">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,2,2,2,-1,-2,-5,-2,-1,2,2,2,0,0,-1).
%F A147851 a(n) = 2*a(n-3) + 2*a(n-4) + 2*a(n-5) - a(n-6) - 2*a(n-7) - 5*a(n-8) - 2*a(n-9) - a(n-10) + 2*a(n-11) + 2*a(n-12) + 2*a(n-13) - a(n-16). - _Franck Maminirina Ramaharo_, Nov 02 2018
%t A147851 CoefficientList[Series[1/(1 - x^3 - x^4 - x^5 + x^8)^2, {x, 0, 50}], x]
%o A147851 (PARI) x='x+O('x^50); Vec(1/(1-x^3-x^4-x^5+x^8)^2) \\ _G. C. Greubel_, Nov 03 2018
%o A147851 (Magma) m:=50; R<x>:=PowerSeriesRing(Integers(), m); Coefficients(R!(1/(1 -x^3-x^4-x^5+x^8)^2)); // _G. C. Greubel_, Nov 03 2018
%Y A147851 Cf. A107479, A107480, A109538, A109543, A109544, A114749, A125950, A130844, A143335.
%K A147851 nonn,easy
%O A147851 0,4
%A A147851 _Roger L. Bagula_, Nov 15 2008
%E A147851 Name clarified by _Franck Maminirina Ramaharo_, Nov 02 2018