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 A188748 #9 Feb 20 2018 05:19:07 %S A188748 7,49,292,1723,10327,61996,371641,2227333,13350748,80027347,479695855, %T A188748 2875358812,17235289777,103310698477,619258487404,3711920099323, %U A188748 22249757087527,133368089673676,799426585401961,4791872379016597 %N A188748 Number of 3 X n binary arrays without the pattern 1 1 1 diagonally, vertically or antidiagonally. %C A188748 Row 3 of A188747. %H A188748 R. H. Hardin, <a href="/A188748/b188748.txt">Table of n, a(n) for n = 1..200</a> %F A188748 Empirical: a(n) = 6*a(n-1) -2*a(n-2) +11*a(n-3) +10*a(n-4) -30*a(n-5) -12*a(n-6). %F A188748 Empirical g.f.: x*(7 + 7*x + 12*x^2 - 8*x^3 - 36*x^4 - 12*x^5) / (1 - 6*x + 2*x^2 - 11*x^3 - 10*x^4 + 30*x^5 + 12*x^6). - _Colin Barker_, Feb 20 2018 %e A188748 Some solutions for 3 X 3: %e A188748 ..0..1..1....0..0..1....1..0..0....1..0..0....0..0..1....1..1..0....0..1..0 %e A188748 ..1..0..0....1..0..0....0..1..1....1..0..1....1..0..1....1..0..0....1..1..0 %e A188748 ..0..0..0....0..0..0....1..0..0....0..0..0....1..0..0....0..1..1....0..0..1 %K A188748 nonn %O A188748 1,1 %A A188748 _R. H. Hardin_, Apr 09 2011