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 A273729 #7 May 28 2016 16:08:02 %S A273729 1,1,2,7484400 %N A273729 Number of n-ary heaps on n levels (i.e., of A023037(n) elements). %C A273729 a(5), a(6), a(7) have 1774, 31436, 625065 decimal digits, respectively. %H A273729 Alois P. Heinz, <a href="/A273729/b273729.txt">Table of n, a(n) for n = 0..4</a> %H A273729 Wikipedia, <a href="https://en.wikipedia.org/wiki/D-ary_heap">D-ary heap</a> %F A273729 a(n) = A273712(n,n). %Y A273729 Main diagonal of A273712. %Y A273729 Cf. A023037. %K A273729 nonn %O A273729 0,3 %A A273729 _Alois P. Heinz_, May 28 2016