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 A336726 #6 Aug 03 2020 03:42:20 %S A336726 1,3,7,13,25,47,89,169,321,599,1125,2097,3925,7317,13667,25389,47313, %T A336726 87781,163265,302617,562023,1040465,1929879,3569627,6613725,12223777, %U A336726 22626357,41790173,77289525,142665435,263661315,486420171,898372311,1656580751,3057774587,5636030345 %N A336726 Number of n-step self-avoiding walks on the half-Manhattan lattice with no non-contiguous adjacencies. %C A336726 In the half-Manhattan lattice, E-W streets run alternately E and W, but N-S streets are two way. %Y A336726 Cf. A336724 (self-avoiding walks), A336662 (Manhattan lattice), A173380 (square lattice). %K A336726 nonn,walk %O A336726 0,2 %A A336726 _Sean A. Irvine_, Aug 02 2020