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 A205759 #6 Jul 22 2025 19:01:21 %S A205759 383440,3602578,29561841,341919297,3496020388,45262306396, %T A205759 528507252157,7409837678586,95546688005488,1427488689168257 %N A205759 Number of 8X(n+1) 0..2 arrays with every 2X2 subblock having the same number of equal edges as its horizontal neighbors and a different number from its vertical neighbors, and new values 0..2 introduced in row major order. %C A205759 Row 7 of A205753 %e A205759 Some solutions for n=4 %e A205759 ..0..1..0..2..1....0..1..1..0..1....0..0..0..1..1....0..1..0..2..2 %e A205759 ..2..0..1..0..2....0..0..0..0..0....2..2..0..0..0....1..1..0..2..0 %e A205759 ..2..0..0..0..0....0..0..0..0..0....0..1..1..2..1....0..2..0..1..0 %e A205759 ..1..1..2..1..2....0..1..1..1..0....0..0..1..1..1....2..0..2..0..1 %e A205759 ..0..1..1..1..1....0..2..0..2..2....1..2..2..0..2....1..0..1..0..2 %e A205759 ..2..2..0..2..0....2..2..2..2..0....1..2..0..0..0....1..1..1..0..0 %e A205759 ..2..0..0..0..0....0..1..0..1..0....0..2..1..2..1....2..0..2..2..1 %e A205759 ..1..1..2..1..2....1..2..1..2..1....0..2..1..1..1....2..2..2..1..1 %K A205759 nonn %O A205759 1,1 %A A205759 _R. H. Hardin_ Jan 30 2012