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 A297600 #4 Jan 01 2018 12:12:14 %S A297600 1,178,1701,6962,93150,1172288,9403199,85828150,919035936,8853487049, %T A297600 82411356392,809231737581,7936987592888,76162052363914, %U A297600 735775369925651,7159378085264000,69324523431873026,670205953180878528 %N A297600 Number of 7Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 5 neighboring 1s. %C A297600 Row 7 of A297595. %H A297600 R. H. Hardin, <a href="/A297600/b297600.txt">Table of n, a(n) for n = 1..210</a> %e A297600 Some solutions for n=5 %e A297600 ..0..0..0..0..0. .0..1..0..1..0. .0..0..1..0..1. .1..0..1..0..0 %e A297600 ..1..1..0..1..1. .1..0..0..0..1. .0..0..1..1..0. .1..1..0..0..0 %e A297600 ..0..0..0..0..0. .0..0..0..0..0. .0..0..1..0..1. .1..0..1..0..0 %e A297600 ..1..1..0..1..1. .0..1..0..1..1. .1..0..0..0..0. .1..0..0..0..0 %e A297600 ..0..0..0..0..0. .1..0..0..0..0. .0..1..0..0..0. .0..1..0..0..0 %e A297600 ..0..0..0..0..0. .0..0..0..1..0. .0..0..0..0..0. .0..1..0..1..1 %e A297600 ..0..0..0..0..0. .1..1..0..0..1. .1..1..0..1..1. .1..0..0..0..0 %Y A297600 Cf. A297595. %K A297600 nonn %O A297600 1,2 %A A297600 _R. H. Hardin_, Jan 01 2018