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 A297298 #4 Dec 27 2017 21:12:55 %S A297298 1,9,32,130,600,2816,13504,65521,319835,1566612,7687400,37759082, %T A297298 185561978,912173296,4484666199,22050441495,108423345160,533136119034, %U A297298 2621552944596,12890861627884,63387955860276,311696797461453 %N A297298 Number of nX7 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 2 neighboring 1s. %C A297298 Column 7 of A297299. %H A297298 R. H. Hardin, <a href="/A297298/b297298.txt">Table of n, a(n) for n = 1..210</a> %F A297298 Empirical: a(n) = 7*a(n-1) -6*a(n-2) -26*a(n-3) +18*a(n-4) +37*a(n-5) -25*a(n-7) -9*a(n-8) -6*a(n-9) -2*a(n-10) +6*a(n-11) +5*a(n-12) for n>14 %e A297298 Some solutions for n=5 %e A297298 ..0..0..0..0..0..0..0. .0..1..1..0..0..0..0. .0..0..0..1..1..1..0 %e A297298 ..0..0..1..1..1..1..0. .1..1..0..0..0..0..0. .0..0..1..0..1..1..1 %e A297298 ..0..1..0..0..1..1..1. .0..0..0..0..0..0..0. .0..1..0..0..0..1..1 %e A297298 ..1..1..1..0..0..1..0. .0..1..1..0..0..1..1. .1..1..1..1..0..1..0 %e A297298 ..0..1..1..1..1..0..0. .1..1..0..0..1..1..0. .0..0..1..1..1..0..0 %Y A297298 Cf. A297299. %K A297298 nonn %O A297298 1,2 %A A297298 _R. H. Hardin_, Dec 27 2017