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 A022445 #10 May 16 2019 08:04:16
%S A022445 1,0,4,10,34,94,222,516,1202,2738,6110,13496,29586,64350,139006,
%T A022445 298636,638578,1359754,2884638,6099552,12859730,27040694,56723774,
%U A022445 118732340,248034354,517208034,1076694622,2237946376,4645007122
%N A022445 Number of self-avoiding closed walks (from 0 to 0) of length 2n in the strip {0, 1, 2} X Z of the square lattice Z X Z.
%D A022445 J. Labelle, Self-avoiding walks and polyominoes in strips, Bull. ICA, 23 (1998), 88-98.
%F A022445 G.f.: (-6*x^7+10*x^6-18*x^5+27*x^4-14*x^3+10*x^2-4*x+1) / ((1+x^2)^2*(1-2*x)^2) (conjectured). - _Ralf Stephan_, Apr 28 2004
%K A022445 nonn,walk,easy
%O A022445 0,3
%A A022445 Jacques Labelle (labelle.jacques(AT)uqam.ca)
%E A022445 More terms from _Sean A. Irvine_, May 16 2019