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 A298184 #6 May 03 2020 15:45:25 %S A298184 0,1,1,3,5,10,19,41,81,196,474,1315,3871,15716,68291,339947,1851904, %T A298184 11717321,86766476 %N A298184 Number of n X n 0..1 arrays with every element equal to 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero. %C A298184 Diagonal of A298187. %e A298184 Some solutions for n=7 %e A298184 ..0..0..0..1..1..1..1. .0..0..0..0..0..0..0. .0..0..0..1..1..0..0 %e A298184 ..0..0..0..1..1..1..1. .0..0..0..0..0..0..0. .0..0..0..1..1..0..0 %e A298184 ..0..0..0..1..1..1..1. .0..0..0..0..0..0..0. .0..0..0..1..1..0..0 %e A298184 ..0..0..0..1..1..1..1. .0..0..0..0..0..0..0. .0..0..0..1..1..0..0 %e A298184 ..0..0..0..1..1..1..1. .0..0..0..0..0..0..0. .0..0..0..1..1..0..0 %e A298184 ..0..0..0..1..1..1..1. .1..1..1..1..1..1..1. .0..0..0..1..1..0..0 %e A298184 ..0..0..0..1..1..1..1. .1..1..1..1..1..1..1. .0..0..0..1..1..0..0 %Y A298184 Cf. A298187. %K A298184 nonn %O A298184 1,4 %A A298184 _R. H. Hardin_, Jan 14 2018