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 A233058 #7 Jul 23 2025 07:49:51 %S A233058 7,16,33,66,132,265,530,1052,2092,4183,8354,16635,33179,66383,132711, %T A233058 264751,528676,1057904,2115653,4224206,8439821,16888361,33778253, %U A233058 67474289,134850638,269827760,539703540,1078399254,2155614282,4313028554 %N A233058 Number of (n+1)X(1+1) 0..1 arrays x(i,j) with row sums sum{x(i,j), j=1..1+1} nondecreasing, and column sums sum{i*x(i,j), i=1..n+1} nondecreasing. %C A233058 Column 1 of A233062 %H A233058 R. H. Hardin, <a href="/A233058/b233058.txt">Table of n, a(n) for n = 1..68</a> %e A233058 Some solutions for n=5 %e A233058 ..1..0....0..0....0..0....0..0....0..1....0..0....0..0....0..0....0..0....0..0 %e A233058 ..1..0....0..0....0..0....0..0....0..1....1..0....0..1....0..0....0..0....0..1 %e A233058 ..0..1....0..0....0..0....0..0....0..1....0..1....0..1....0..0....0..1....0..1 %e A233058 ..0..1....0..1....0..0....1..1....0..1....0..1....1..1....0..0....1..0....0..1 %e A233058 ..0..1....1..0....1..0....1..1....1..0....0..1....1..1....0..0....1..0....0..1 %e A233058 ..0..1....0..1....0..1....1..1....1..1....0..1....1..1....1..1....0..1....0..1 %K A233058 nonn %O A233058 1,1 %A A233058 _R. H. Hardin_, Dec 03 2013