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 A273695 #6 May 28 2016 10:25:14 %S A273695 1,1,1,2,6,24,120,720,5040,40320,181440,1209600,9979200,95800320, %T A273695 1037836800,12454041600,163459296000,2324754432000,19760412672000, %U A273695 237124952064000,3379030566912000,54064489070592000,946128558735360000,17841281393295360000 %N A273695 Number of 8-ary heaps on n elements. %H A273695 Alois P. Heinz, <a href="/A273695/b273695.txt">Table of n, a(n) for n = 0..474</a> %H A273695 Wikipedia, <a href="https://en.wikipedia.org/wiki/D-ary_heap">D-ary heap</a> %Y A273695 Column k=8 of A273693. %K A273695 nonn %O A273695 0,4 %A A273695 _Alois P. Heinz_, May 28 2016