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 A183583 #6 Jul 22 2025 09:06:39 %S A183583 194,354615,171459557,92915045150,49526167251643,26548571098836075, %T A183583 14217486118795912134 %N A183583 Half the number of nX8 0..3 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors. %C A183583 Column 8 of A183584 %e A183583 Some solutions with a(1,1)<=1 for 3X8 %e A183583 ..0..0..0..0..1..1..0..0....0..0..0..3..3..0..0..0....0..0..0..0..0..0..3..3 %e A183583 ..0..0..0..1..1..1..1..1....0..0..0..0..3..0..0..2....0..0..0..1..0..3..3..3 %e A183583 ..0..0..0..1..1..0..0..1....0..0..0..0..3..0..0..2....0..0..0..1..1..1..1..1 %K A183583 nonn %O A183583 1,1 %A A183583 _R. H. Hardin_ Jan 05 2011