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 A264288 #4 Nov 10 2015 14:58:35 %S A264288 1,69,556,4484,47492,448821,4227024,40561798,385401502,3654429812, %T A264288 34690006705,329163589542,3121764930650,29603292090987, %U A264288 280717647093650,2661785027200918,25238274365506684,239298584328248763 %N A264288 Number of (4+1)X(n+1) arrays of permutations of 0..n*5+4 with each element having directed index change 0,0 0,1 1,0 or -1,-2. %C A264288 Row 4 of A264285. %H A264288 R. H. Hardin, <a href="/A264288/b264288.txt">Table of n, a(n) for n = 1..210</a> %e A264288 Some solutions for n=4 %e A264288 ..0..1..2..3..4....0..1..9..2..3....7..1..9..2..3....0..1..9..2..4 %e A264288 ..5.13..6..7..9...12..6..7..8..4....0..5..6..8..4....5..6..7..3..8 %e A264288 .17.10.12..8.14....5.10.11.13.14...10.18.11.12.14...17.10.11.12.14 %e A264288 .15.11.16.18.19...15.23.16.17.19...22.15.16.13.19...22.23.16.13.19 %e A264288 .20.21.22.23.24...20.21.22.18.24...20.21.17.23.24...15.20.21.18.24 %Y A264288 Cf. A264285. %K A264288 nonn %O A264288 1,2 %A A264288 _R. H. Hardin_, Nov 10 2015