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 A297797 #4 Jan 06 2018 09:28:36 %S A297797 1,11,37,108,533,2434,10287,45968,207906,927565,4149639,18631844, %T A297797 83542062,374482908,1679592819,7532686680,33779595704,151490828968, %U A297797 679394507158,3046851336221,13664151868643,61279503538129 %N A297797 Number of nX3 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2, 3 or 5 neighboring 1s. %C A297797 Column 3 of A297802. %H A297797 R. H. Hardin, <a href="/A297797/b297797.txt">Table of n, a(n) for n = 1..210</a> %F A297797 Empirical: a(n) = 3*a(n-1) +46*a(n-3) -56*a(n-4) +43*a(n-5) -576*a(n-6) +284*a(n-7) -620*a(n-8) +1922*a(n-9) -364*a(n-10) +1288*a(n-11) +884*a(n-12) -496*a(n-13) +504*a(n-14) -352*a(n-15) %e A297797 Some solutions for n=7 %e A297797 ..1..1..0. .0..0..0. .1..1..0. .0..1..1. .1..1..0. .0..1..1. .0..0..0 %e A297797 ..1..1..1. .0..0..0. .1..1..0. .1..1..0. .0..1..1. .1..1..0. .0..1..0 %e A297797 ..0..0..0. .0..0..0. .0..1..1. .0..1..1. .1..1..0. .0..1..1. .1..1..1 %e A297797 ..1..1..0. .0..1..1. .0..1..0. .0..0..1. .0..0..0. .0..1..0. .0..0..0 %e A297797 ..1..1..0. .0..1..1. .1..0..1. .1..1..1. .0..0..0. .0..0..1. .1..1..0 %e A297797 ..0..1..0. .1..1..0. .1..1..1. .1..1..1. .1..1..0. .0..1..1. .1..1..1 %e A297797 ..1..1..1. .0..1..1. .1..1..0. .0..1..1. .1..1..0. .0..1..1. .0..0..0 %Y A297797 Cf. A297802. %K A297797 nonn %O A297797 1,2 %A A297797 _R. H. Hardin_, Jan 06 2018