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 A298923 #6 Sep 04 2022 13:19:37 %S A298923 0,64,8,9,17,22,31,83,92,172,309,549,923,1830,3021,5580,10091,18344, %T A298923 33025,61470,111014,205198,376471,694579,1277419,2365958,4360085, %U A298923 8074209,14929946,27656016,51194508,94924809,175864241,326176032,604808134 %N A298923 Number of n X 7 0..1 arrays with every element equal to 1, 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero. %C A298923 Column 7 of A298924. %H A298923 R. H. Hardin, <a href="/A298923/b298923.txt">Table of n, a(n) for n = 1..210</a> %e A298923 Some solutions for n=5 %e A298923 ..0..0..0..0..0..1..1. .0..0..0..0..1..1..1. .0..0..0..1..1..0..1 %e A298923 ..0..0..0..0..0..1..1. .0..0..0..0..1..1..1. .0..0..0..1..1..0..1 %e A298923 ..0..0..0..0..0..1..1. .0..0..0..0..1..1..1. .0..0..0..1..1..0..0 %e A298923 ..0..0..0..0..0..1..1. .0..0..0..0..1..1..1. .0..0..0..1..1..0..1 %e A298923 ..0..0..0..0..0..1..1. .0..0..0..0..1..1..1. .0..0..0..1..1..0..1 %Y A298923 Cf. A298924. %K A298923 nonn %O A298923 1,2 %A A298923 _R. H. Hardin_, Jan 29 2018