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 A188515 #8 Jul 22 2025 11:14:40 %S A188515 2,16,229,6760,342240,32470385,5593606875,1811059364020, %T A188515 1103649329789000,1283030748540574429,2858394905740312536937, %U A188515 12271770983630246007920447,101822638806356395388304091003,1636793382556126237888634491914956 %N A188515 Number of n X n binary arrays without the pattern 1 1 0 diagonally, vertically or horizontally. %C A188515 Diagonal of A188523 %e A188515 Some solutions for 3X3 %e A188515 ..0..1..0....0..0..1....1..1..1....0..0..0....0..0..0....1..0..1....1..1..1 %e A188515 ..1..1..1....0..1..0....0..0..1....0..0..0....0..0..0....0..1..0....0..0..1 %e A188515 ..0..1..1....1..0..1....0..0..1....0..0..1....0..1..1....1..1..1....1..0..1 %K A188515 nonn %O A188515 1,1 %A A188515 _R. H. Hardin_ Apr 02 2011