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 A267713 #6 Apr 20 2020 19:46:12 %S A267713 2,16,102,872,4444,26906,116036,592110,2411426,11438402,45729992, %T A267713 209204918,830949994,3719941006,14733123252,64989888570 %N A267713 Number of n X n 0..1 arrays with every repeated value in every row and column greater than the previous repeated value. %C A267713 Diagonal of A267719. %e A267713 Some solutions for n=5 %e A267713 ..1..0..1..1..0....1..0..1..1..0....1..0..1..0..1....0..1..1..0..1 %e A267713 ..0..1..0..0..1....0..1..0..0..1....0..1..0..1..0....1..0..0..1..1 %e A267713 ..0..0..1..1..0....1..0..1..1..0....1..0..1..0..1....0..1..0..1..0 %e A267713 ..1..0..0..1..0....1..0..0..1..1....1..0..1..0..0....1..0..1..0..1 %e A267713 ..0..1..0..0..1....0..1..0..0..1....0..1..0..1..0....1..1..0..1..0 %Y A267713 Cf. A267719. %K A267713 nonn %O A267713 1,1 %A A267713 _R. H. Hardin_, Jan 19 2016