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 A202558 #6 Jul 22 2025 16:39:16 %S A202558 7,151,2848,57255,1126437,22360610,436020774,8531393529,165372103634, %T A202558 3209822188135,61997477071836,1199480307020988,23143113343639189, %U A202558 447443373807337136,8639247851127637315 %N A202558 Number of nX6 0,1 arrays with the row and column sums nondecreasing. %C A202558 Column 6 of A202560 %e A202558 Some solutions for n=4 %e A202558 ..0..0..1..0..1..0....0..0..1..0..1..1....0..1..0..1..1..1....0..0..1..0..1..1 %e A202558 ..0..0..1..1..0..1....0..1..0..1..0..1....1..1..1..0..0..1....1..1..0..0..0..1 %e A202558 ..1..1..0..1..1..1....0..0..1..0..1..1....1..0..1..1..1..1....0..0..0..1..1..1 %e A202558 ..1..1..0..1..1..1....1..1..0..1..1..0....1..1..1..1..1..1....0..0..1..1..1..1 %K A202558 nonn %O A202558 1,1 %A A202558 _R. H. Hardin_ Dec 21 2011