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 A139674 #8 Mar 09 2020 20:55:23 %S A139674 1,764,708256,805036704,1127512146540,1966499966796816, %T A139674 4274712091685443584,11528251571501588791296, %U A139674 38295413179145036856212700,155411811543624388078758718000,763997249847515085736557734880512,4511824317564827934662170498445281792 %N A139674 Number of n X n symmetric binary matrices with all row sums 7. %H A139674 Andrew Howroyd, <a href="/A139674/b139674.txt">Table of n, a(n) for n = 7..20</a> %Y A139674 Column k=7 of A333157 and row 7 of A188448. %K A139674 nonn %O A139674 7,2 %A A139674 _R. H. Hardin_, Jun 12 2008 %E A139674 Terms a(13) and beyond from _Andrew Howroyd_, Mar 09 2020