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 A206619 #7 Jul 22 2025 19:33:11 %S A206619 192358,62250328,26135187233,10633148505553,4289914143971114, %T A206619 1738678950539792051,704228581922250103909,285197699391932223744199, %U A206619 115508361295861948938141134,46781700029539016314279246512 %N A206619 Number of (n+1)X7 0..2 arrays with every 2X3 or 3X2 subblock having no more than two equal edges, and new values 0..2 introduced in row major order. %C A206619 Column 6 of A206621 %H A206619 R. H. Hardin, <a href="/A206619/b206619.txt">Table of n, a(n) for n = 1..12</a> %e A206619 Some solutions for n=4 %e A206619 ..0..0..1..1..0..0..1....0..1..0..2..1..2..2....0..0..0..0..0..0..1 %e A206619 ..0..2..0..2..0..1..2....1..1..0..1..2..0..0....2..1..2..1..2..1..2 %e A206619 ..1..0..2..1..1..2..2....2..0..1..2..0..0..1....0..0..2..0..2..0..1 %e A206619 ..2..2..1..0..0..1..0....1..2..0..1..2..2..0....2..1..0..1..1..1..0 %e A206619 ..1..2..1..0..1..2..0....0..1..1..2..0..1..2....1..0..1..2..1..2..1 %K A206619 nonn %O A206619 1,1 %A A206619 _R. H. Hardin_ Feb 10 2012