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 A298927 #4 Jan 29 2018 08:15:42 %S A298927 0,11,3,23,94,255,666,2720,8571,30093,106192,369318,1291934,4552705, %T A298927 15952349,56078262,197277132,693611434,2438933680,8579643205, %U A298927 30173988847,106130105150,373307026724,1313049614295,4618497134678,16245278266932 %N A298927 Number of nX5 0..1 arrays with every element equal to 2, 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero. %C A298927 Column 5 of A298930. %H A298927 R. H. Hardin, <a href="/A298927/b298927.txt">Table of n, a(n) for n = 1..210</a> %e A298927 Some solutions for n=5 %e A298927 ..0..0..1..0..0. .0..0..1..0..0. .0..0..1..0..0. .0..0..1..1..1 %e A298927 ..0..1..1..0..0. .0..1..1..1..0. .1..0..1..1..0. .0..0..1..1..1 %e A298927 ..1..1..1..1..1. .1..0..0..0..1. .1..1..0..0..1. .0..0..1..1..1 %e A298927 ..0..0..1..0..1. .0..1..1..1..0. .1..0..1..1..0. .0..0..1..1..1 %e A298927 ..0..1..1..0..0. .0..0..1..0..0. .0..0..1..0..0. .0..0..1..1..1 %Y A298927 Cf. A298930. %K A298927 nonn %O A298927 1,2 %A A298927 _R. H. Hardin_, Jan 29 2018