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 A273697 #6 May 28 2016 10:27:13 %S A273697 1,1,1,2,6,24,120,720,5040,40320,362880,3628800,19958400,159667200, %T A273697 1556755200,17435658240,217945728000,2988969984000,44460928512000, %U A273697 711374856192000,12164510040883200,221172909834240000,2322315553259520000,34060628114472960000 %N A273697 Number of 10-ary heaps on n elements. %H A273697 Alois P. Heinz, <a href="/A273697/b273697.txt">Table of n, a(n) for n = 0..470</a> %H A273697 Wikipedia, <a href="https://en.wikipedia.org/wiki/D-ary_heap">D-ary heap</a> %Y A273697 Column k=10 of A273693. %K A273697 nonn %O A273697 0,4 %A A273697 _Alois P. Heinz_, May 28 2016