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 A207986 #7 Jul 22 2025 21:04:44 %S A207986 191,36481,4827482,622569385,81269646503,10629041648848, %T A207986 1389619561706920,181656690367717549,23747206634938949550, %U A207986 3104389538995895621609,405825684024902268661064,53052111709600970085125290 %N A207986 Number of nX5 0..2 arrays avoiding the pattern z z+1 z horizontally and z z-1 z vertically. %C A207986 Column 5 of A207989 %H A207986 R. H. Hardin, <a href="/A207986/b207986.txt">Table of n, a(n) for n = 1..210</a> %e A207986 Some solutions for n=4 %e A207986 ..0..2..2..0..0....2..2..1..2..2....2..0..1..2..2....0..1..2..2..0 %e A207986 ..1..0..1..1..2....2..1..0..0..1....1..1..1..1..2....0..0..2..0..2 %e A207986 ..2..2..1..2..2....2..1..0..1..1....1..2..2..0..0....2..0..1..1..0 %e A207986 ..2..1..2..2..1....0..2..2..0..0....1..0..2..2..1....0..2..0..1..2 %K A207986 nonn %O A207986 1,1 %A A207986 _R. H. Hardin_ Feb 22 2012