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