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 A298658 #4 Jan 24 2018 10:10:23 %S A298658 5,49,34,173,431,1116,2562,6711,17405,48462,125671,334571,901387, %T A298658 2398458,6398293,17158639,45911441,122885609,329214517,881849126, %U A298658 2361859125,6328533398,16955926709,45429854362,121730159805,326179436515 %N A298658 Number of nX6 0..1 arrays with every element equal to 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero. %C A298658 Column 6 of A298660. %H A298658 R. H. Hardin, <a href="/A298658/b298658.txt">Table of n, a(n) for n = 1..210</a> %e A298658 Some solutions for n=5 %e A298658 ..0..1..0..0..1..1. .0..1..0..1..1..0. .0..1..1..1..1..0. .0..1..0..0..1..0 %e A298658 ..1..0..0..0..0..0. .1..0..1..0..0..1. .0..0..1..1..0..0. .1..0..1..1..1..0 %e A298658 ..0..0..0..1..0..1. .1..0..0..0..1..0. .0..0..1..1..1..1. .0..0..1..1..1..0 %e A298658 ..0..0..0..1..1..0. .1..0..0..0..0..1. .1..0..1..0..1..0. .0..0..1..0..1..0 %e A298658 ..0..1..1..0..1..0. .1..0..1..1..1..0. .1..0..0..0..1..0. .0..1..1..0..1..1 %Y A298658 Cf. A298660. %K A298658 nonn %O A298658 1,1 %A A298658 _R. H. Hardin_, Jan 24 2018