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 A351158 #14 Dec 29 2024 21:56:13 %S A351158 2,5,15,56,275,1897,18948 %N A351158 Number of n X n symmetric 0-1 matrices where rows are sorted lexicographically and row sums are nondecreasing. %Y A351158 Cf. A016121, A351157, A351287, A351288. %K A351158 nonn,hard,more %O A351158 1,1 %A A351158 _Max Alekseyev_, Feb 02 2022