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 A188752 #7 Jul 22 2025 11:20:53 %S A188752 81,6561,289776,15398676,828466161,43558358008,2307086087740, %T A188752 122293738629021,6476421031528420,343061756270359870, %U A188752 18173221774555803823,962672885162309091074,50995334218704721900811 %N A188752 Number of 7Xn binary arrays without the pattern 1 1 1 diagonally, vertically or antidiagonally. %C A188752 Row 7 of A188747 %H A188752 R. H. Hardin, <a href="/A188752/b188752.txt">Table of n, a(n) for n = 1..200</a> %e A188752 Some solutions for 7X3 %e A188752 ..0..1..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..1....0..0..0 %e A188752 ..0..0..0....1..1..1....1..1..1....0..0..0....0..1..1....0..1..0....1..1..1 %e A188752 ..1..1..0....1..0..1....0..1..1....1..1..0....0..0..0....0..1..1....0..0..0 %e A188752 ..0..0..0....0..0..0....0..0..0....0..0..0....0..1..0....0..0..0....0..1..1 %e A188752 ..0..0..0....0..0..0....0..0..0....0..1..1....1..1..0....0..1..0....1..1..0 %e A188752 ..0..0..1....0..0..0....0..1..0....1..0..0....0..0..1....0..0..1....0..0..0 %e A188752 ..1..0..1....1..0..0....1..1..1....0..0..0....1..1..1....0..0..0....0..1..1 %K A188752 nonn %O A188752 1,1 %A A188752 _R. H. Hardin_ Apr 09 2011