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 A185901 #8 Jul 22 2025 10:07:28 %S A185901 8,2765,546280,139230658,32611077940,7921723799549,1897334511466261, %T A185901 457135757368429048,109875454057222039886,26435697398605508731039, %U A185901 6357732815393016703934708,1529282331683348275213637905 %N A185901 1/8 the number of nX4 0..7 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors. %C A185901 Column 4 of A185903 %e A185901 Some solutions for 3X4 with a(1,1)=0 %e A185901 ..0..4..4..3....0..0..6..6....0..4..1..0....0..0..4..5....0..0..5..4 %e A185901 ..0..0..1..3....2..0..3..3....0..4..1..0....4..0..4..5....0..6..5..4 %e A185901 ..6..6..1..1....2..2..2..3....7..7..2..2....4..0..3..3....0..6..3..3 %K A185901 nonn %O A185901 1,1 %A A185901 _R. H. Hardin_ Feb 06 2011