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 A139671 #8 Mar 09 2020 20:54:42 %S A139671 1,76,6912,848932,133948836,26615510712,6549149852112, %T A139671 1966499966796816,711040444591249476,305907023641901084832, %U A139671 154921887640109512226304,91469751377953081098144816,62419855497729620428436222688,48849705066296300911892229634944 %N A139671 Number of n X n symmetric binary matrices with all row sums 5. %H A139671 Andrew Howroyd, <a href="/A139671/b139671.txt">Table of n, a(n) for n = 5..25</a> %Y A139671 Column k=5 of A333157 and row 5 of A188448. %K A139671 nonn %O A139671 5,2 %A A139671 _R. H. Hardin_, Jun 12 2008 %E A139671 Terms a(13) and beyond from _Andrew Howroyd_, Mar 09 2020