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 A285754 #6 Apr 05 2020 23:22:52 %S A285754 0,206,5105,125088,3640966,99685406,3020617824,86939481532, %T A285754 2666601331554,79052897096336,2437071630790169,73583527506072928, %U A285754 2276218136245984554,69547330813342998878,2157487582330157678600,66455374887634153596624 %N A285754 Number of 5 X n 0..1 arrays with the number of 1's horizontally, diagonally or antidiagonally adjacent to some 0 one less than the number of 0's adjacent to some 1. %C A285754 Row 5 of A285750. %H A285754 R. H. Hardin, <a href="/A285754/b285754.txt">Table of n, a(n) for n = 1..55</a> %e A285754 Some solutions for n=4 %e A285754 ..0..1..1..1. .1..0..0..1. .1..0..0..0. .0..0..0..1. .0..1..0..1 %e A285754 ..1..0..1..1. .0..1..0..0. .0..0..0..1. .1..0..0..1. .1..1..1..0 %e A285754 ..0..0..1..0. .1..1..0..1. .0..1..0..1. .1..0..1..0. .0..1..0..0 %e A285754 ..1..0..0..0. .0..0..1..0. .0..1..1..0. .0..0..1..0. .1..0..1..0 %e A285754 ..1..0..0..1. .1..0..0..1. .1..1..1..1. .1..0..1..1. .0..0..1..1 %Y A285754 Cf. A285750. %K A285754 nonn %O A285754 1,2 %A A285754 _R. H. Hardin_, Apr 25 2017