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 A302430 #4 Apr 07 2018 17:24:06 %S A302430 16,21,51,148,372,1359,4223,12765,36991,120577,379049,1163511,3513789, %T A302430 11057011,34615371,107067003,328256519,1021668031,3184852651, %U A302430 9877177123,30474354613,94542321045,293938006889,912146326937,2822284649841 %N A302430 Number of 5Xn 0..1 arrays with every element equal to 0, 1, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302430 Row 5 of A302427. %H A302430 R. H. Hardin, <a href="/A302430/b302430.txt">Table of n, a(n) for n = 1..210</a> %e A302430 Some solutions for n=5 %e A302430 ..0..1..0..1..0. .0..1..1..0..0. .0..1..0..0..1. .0..0..1..1..0 %e A302430 ..0..1..0..1..0. .0..1..0..1..0. .1..0..0..0..0. .0..1..0..1..0 %e A302430 ..0..1..0..1..0. .0..1..0..1..0. .1..0..1..0..1. .0..1..0..1..0 %e A302430 ..0..1..0..1..1. .0..1..1..1..0. .1..0..1..1..0. .0..1..0..1..1 %e A302430 ..0..1..0..1..0. .0..1..0..0..0. .1..1..0..1..0. .1..0..0..1..0 %Y A302430 Cf. A302427. %K A302430 nonn %O A302430 1,1 %A A302430 _R. H. Hardin_, Apr 07 2018