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 A202370 #7 Jul 22 2025 16:32:56 %S A202370 98,824,7349,62033,589613,5444710,51833855,500733797,4838603161, %T A202370 47316275496,463941283342 %N A202370 Number of (n+2)X(n+2) binary arrays avoiding patterns 001 and 111 in rows and columns. %C A202370 Diagonal of A202378 %e A202370 Some solutions for n=4 %e A202370 ..0..1..1..0..1..0....1..0..1..1..0..1....1..1..0..1..0..0....0..1..0..1..0..1 %e A202370 ..1..0..1..0..1..1....0..1..0..1..0..1....0..1..1..0..1..0....1..1..0..1..0..0 %e A202370 ..0..1..0..0..0..0....1..0..1..0..0..0....1..0..1..1..0..0....0..0..0..0..0..0 %e A202370 ..1..0..0..0..0..0....0..1..1..0..0..0....0..1..0..0..0..0....1..1..0..0..0..0 %e A202370 ..1..0..0..0..0..0....1..1..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0 %e A202370 ..0..0..0..0..0..0....1..0..1..0..0..0....0..0..0..0..0..0....1..1..0..0..0..0 %K A202370 nonn %O A202370 1,1 %A A202370 _R. H. Hardin_ Dec 18 2011