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 A186217 #6 Jul 22 2025 10:19:57 %S A186217 353985,213108423,43035959317,13767728347159,3611859394076247 %N A186217 Number of (n+1)X8 0..2 arrays with every 2X2 subblock determinant equal to some horizontal or vertical neighbor 2X2 subblock determinant. %C A186217 Column 7 of A186218 %e A186217 Some solutions for 3X8 %e A186217 ..0..0..0..2..0..0..2..2....0..0..0..2..2..1..2..0....0..0..0..2..0..2..2..1 %e A186217 ..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0 %e A186217 ..0..0..0..0..2..1..0..1....0..0..0..0..2..0..0..2....0..0..0..1..1..2..0..0 %K A186217 nonn %O A186217 1,1 %A A186217 _R. H. Hardin_ Feb 15 2011