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 A273694 #4 May 28 2016 10:24:35 %S A273694 1,1,1,2,6,24,120,720,5040,20160,120960,907200,7983360,79833600, %T A273694 889574400,10897286400,81729648000,871782912000,11115232128000, %U A273694 160059342643200,2534272925184000,43444678717440000,798295971432960000,8781255685762560000,134645920515025920000 %N A273694 Number of 7-ary heaps on n elements. %H A273694 Alois P. Heinz, <a href="/A273694/b273694.txt">Table of n, a(n) for n = 0..476</a> %H A273694 Wikipedia, <a href="https://en.wikipedia.org/wiki/D-ary_heap">D-ary heap</a> %Y A273694 Column k=7 of A273693. %K A273694 nonn %O A273694 0,4 %A A273694 _Alois P. Heinz_, May 28 2016