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 A207219 #7 Jul 22 2025 20:08:46 %S A207219 529,279841,97935886,33403462497,11574609426324,4019515127529418, %T A207219 1395037573042216457,484100965758678998675,167995026283315198886440, %U A207219 58298967703100379585703272,20231341894128588893547935849 %N A207219 Number of nX6 0..2 arrays avoiding the pattern z z+1 z in any row or column. %C A207219 Column 6 of A207221 %H A207219 R. H. Hardin, <a href="/A207219/b207219.txt">Table of n, a(n) for n = 1..210</a> %e A207219 Some solutions for n=4 %e A207219 ..0..1..2..2..2..0....2..2..1..2..2..2....2..0..1..2..0..2....1..1..2..2..1..1 %e A207219 ..0..1..1..2..0..1....1..0..0..1..2..2....2..0..2..2..0..1....0..1..2..2..1..2 %e A207219 ..2..0..1..1..0..2....0..1..1..0..2..2....2..1..2..2..2..1....2..1..0..0..1..2 %e A207219 ..1..1..2..0..0..2....0..1..1..1..0..2....0..2..1..1..1..2....1..0..2..1..2..2 %K A207219 nonn %O A207219 1,1 %A A207219 _R. H. Hardin_ Feb 16 2012