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 A202751 #17 Mar 09 2024 11:03:43 %S A202751 1,2,8,62,924,26394,1442764,150786848,30114993376,11489639088218, %T A202751 8372083277093216,11649087077771471438,30947648445392475219812, %U A202751 156963868041535457457609234,1519762800266538697863301357568 %N A202751 Number of n X n nonnegative integer arrays with each row and column increasing from zero by 0 or 1. %H A202751 R. H. Hardin, <a href="/A202751/b202751.txt">Table of n, a(n) for n = 1..18</a> %H A202751 Dylan Heuer, <a href="https://arxiv.org/abs/2403.02242">Partial Alternating Sign Matrix Bijections and Dynamics</a>, arXiv:2403.02242 [math.CO], 2024. See p. 6. %H A202751 Dylan Heuer and Jessica Striker, <a href="https://arxiv.org/abs/2012.09901">Partial permutation and alternating sign matrix polytopes</a>, arXiv:2012.09901 [math.CO], 2020. %e A202751 Some solutions for n=5: %e A202751 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 %e A202751 0 0 0 1 1 0 0 0 1 1 0 0 0 1 1 0 0 0 0 0 %e A202751 0 0 0 1 1 0 0 1 1 2 0 0 1 1 1 0 0 0 1 1 %e A202751 0 1 1 1 1 0 0 1 2 3 0 1 1 2 2 0 0 1 2 2 %e A202751 0 1 2 2 2 0 1 2 3 4 0 1 2 2 3 0 1 1 2 3 %Y A202751 Diagonal of A202756. %K A202751 nonn %O A202751 1,2 %A A202751 _R. H. Hardin_, Dec 23 2011