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 A172542 #13 Apr 11 2017 16:57:56 %S A172542 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,355687428096000, %T A172542 3237415247416050491577971184000, %U A172542 13564406360915457771720399143711430952267776000,37911589613425952733393718264069147678877877626169022024515000 %N A172542 Number of n X n 0..1 arrays with row sums 16 and column sums 16. %H A172542 Brendan D. McKay, <a href="/A172542/b172542.txt">Table of n, a(n) for n = 0..30</a> (terms n=1..20 from R. H. Hardin) %H A172542 E. R. Canfield and B. D. McKay, <a href="http://www.combinatorics.org/ojs/index.php/eljc/article/view/v12i1r29">Asymptotic enumeration of dense 0-1 matrices with equal row and column sums</a> %H A172542 Shalosh B. Ekhad and Doron Zeilberger, <a href="http://www.math.rutgers.edu/~zeilberg/mamarim/mamarimhtml/bipartite.html">In How Many Ways Can n (Straight) Men and n (Straight) Women Get Married, if Each Person Has Exactly k Spouses</a>, Maple package Bipartite. %H A172542 B. D. McKay, <a href="http://users.cecs.anu.edu.au/~bdm/data/semiregular.html">0-1 matrices with constant row and column sums</a> %Y A172542 Column k=16 of A008300. %K A172542 nonn %O A172542 0,18 %A A172542 _R. H. Hardin_, Feb 06 2010