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 A298052 #4 Jan 11 2018 07:18:40 %S A298052 3,23,23,73,121,231,422,865,1729,3286,6319,12563,24164,46151,91180, %T A298052 179529,348543,679612,1324925,2580453,5044253,9857924,19226398, %U A298052 37521143,73217267,142924098,278999274,544730946,1063235208,2075512334,4051405413 %N A298052 Number of nX5 0..1 arrays with every element equal to 1, 2, 4 or 6 king-move adjacent elements, with upper left element zero. %C A298052 Column 5 of A298055. %H A298052 R. H. Hardin, <a href="/A298052/b298052.txt">Table of n, a(n) for n = 1..210</a> %e A298052 Some solutions for n=5 %e A298052 ..0..1..0..0..1. .0..0..0..0..0. .0..1..1..1..1. .0..0..1..0..1 %e A298052 ..0..1..1..0..1. .0..1..0..0..1. .0..0..1..1..0. .1..0..1..0..1 %e A298052 ..0..1..1..0..0. .1..1..0..0..1. .1..1..1..0..1. .1..0..0..0..0 %e A298052 ..1..1..1..1..1. .0..0..0..0..0. .0..0..1..0..1. .1..0..0..1..1 %e A298052 ..0..0..0..0..1. .0..1..1..1..1. .0..1..1..0..1. .1..0..1..0..0 %Y A298052 Cf. A298055. %K A298052 nonn %O A298052 1,1 %A A298052 _R. H. Hardin_, Jan 11 2018