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 A300088 #6 Feb 25 2018 06:18:23 %S A300088 21,64,19,359,3089,13646,167131,1179926,7203918,75245386,508116867, %T A300088 3750027371,34007995888,237070967056,1896875784101,15835534124727, %U A300088 116172506766693,951502244265963,7649922105057405,58629569564622365 %N A300088 Number of nX7 0..1 arrays with every element equal to 0, 1, 3, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero. %C A300088 Column 7 of A300089. %H A300088 R. H. Hardin, <a href="/A300088/b300088.txt">Table of n, a(n) for n = 1..141</a> %e A300088 Some solutions for n=5 %e A300088 ..0..1..0..1..0..1..1. .0..0..1..1..1..1..0. .0..1..0..1..0..1..0 %e A300088 ..1..0..0..0..0..0..0. .0..0..1..1..1..1..0. .1..0..0..0..0..0..1 %e A300088 ..0..0..0..0..0..0..0. .0..0..1..1..1..1..1. .1..1..1..1..0..0..0 %e A300088 ..1..0..0..0..0..0..0. .1..1..1..1..1..0..1. .0..1..1..1..0..0..1 %e A300088 ..0..1..0..1..0..1..1. .1..1..1..1..1..0..1. .0..1..1..1..0..0..1 %Y A300088 Cf. A300089. %K A300088 nonn %O A300088 1,1 %A A300088 _R. H. Hardin_, Feb 24 2018