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 A139684 #7 May 08 2020 22:13:19 %S A139684 1,2,8,64,1024,32768,2097152,268435456,68719476736,34575388318705, %T A139684 32448313431713405,52469561348291720657,134755962211702695614887, %U A139684 514006997326078783646604259,2768435750908792178769980837441,20276667790903553518295082198527981 %N A139684 Number of n X n symmetric binary matrices with no row sum greater than 8. %H A139684 Andrew Howroyd, <a href="/A139684/b139684.txt">Table of n, a(n) for n = 0..25</a> %Y A139684 Column k=8 of A334548. %K A139684 nonn %O A139684 0,2 %A A139684 _R. H. Hardin_, Jun 13 2008 %E A139684 Terms a(13) and beyond from _Andrew Howroyd_, May 08 2020