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 A296123 #6 Apr 26 2020 20:58:01 %S A296123 1,5,18,74,2098,54286,1810441,227074899,41069612676,11999602459480, %T A296123 8460640112181759,10489963059013433653 %N A296123 Number of n X n 0..1 arrays with each 1 adjacent to 2 or 5 king-move neighboring 1's. %C A296123 Diagonal of A296128. %e A296123 Some solutions for n=5 %e A296123 ..1..1..0..0..0. .0..1..0..0..0. .1..1..0..0..1. .0..1..1..0..0 %e A296123 ..1..0..0..0..0. .1..1..0..0..0. .1..0..0..1..1. .0..0..1..0..1 %e A296123 ..0..0..0..0..0. .0..0..0..1..0. .0..0..0..0..0. .0..1..1..1..1 %e A296123 ..0..1..1..0..0. .0..0..1..0..1. .0..0..1..0..0. .1..1..1..0..0 %e A296123 ..0..0..1..0..0. .0..0..0..1..0. .0..1..1..0..0. .0..0..1..0..0 %Y A296123 Cf. A296128. %K A296123 nonn %O A296123 1,2 %A A296123 _R. H. Hardin_, Dec 05 2017