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 A114122 #4 Oct 02 2023 10:38:16 %S A114122 1,0,1,2,0,4,4,0,16,0,16,32,0,64,64,0,256,0,256,512,0,1024,1024,0, %T A114122 4096,0,4096,8192,0,16384,16384,0,65536,0,65536,131072,0,262144, %U A114122 262144,0,1048576 %N A114122 Expansion of (1+x)^2/(1+2x-4x^3-4x^4). %C A114122 Binomial transform is A116404. %H A114122 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (-2, 0, 4, 4). %F A114122 a(n)=-2a(n-1)+4a(n-3)+4a(n-4) %K A114122 easy,nonn %O A114122 0,4 %A A114122 _Paul Barry_, Feb 07 2006