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 A297807 #6 Jan 20 2024 18:21:18 %S A297807 1,69,10287,104985,2174696,91376524,3420197908,94927605755, %T A297807 2945816737574,99198658175214,3238876596856894,102656828606240489, %U A297807 3303272683839553667,107246494100102584720,3463595416929051369500,111526884982514579379392 %N A297807 Number of 7 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2, 3 or 5 neighboring 1's. %C A297807 Row 7 of A297802. %H A297807 R. H. Hardin, <a href="/A297807/b297807.txt">Table of n, a(n) for n = 1..210</a> %e A297807 Some solutions for n=4 %e A297807 ..0..0..1..1. .0..1..1..0. .0..1..1..0. .0..0..0..0. .0..0..0..0 %e A297807 ..0..1..1..0. .1..1..0..0. .1..1..1..0. .0..1..1..0. .0..0..1..0 %e A297807 ..0..0..1..0. .0..0..1..0. .0..0..0..0. .0..1..1..1. .0..1..1..1 %e A297807 ..0..1..0..0. .0..1..1..1. .0..0..1..1. .0..0..0..0. .0..1..0..0 %e A297807 ..1..0..1..1. .0..0..0..0. .1..1..1..1. .0..0..1..1. .1..1..0..0 %e A297807 ..1..1..1..0. .0..1..0..0. .1..1..1..1. .0..1..1..1. .1..1..0..0 %e A297807 ..0..1..1..0. .1..1..1..0. .0..0..1..1. .0..0..1..0. .0..0..0..0 %Y A297807 Cf. A297802. %K A297807 nonn %O A297807 1,2 %A A297807 _R. H. Hardin_, Jan 06 2018