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A273696
Number of 9-ary heaps on n elements.
3
1, 1, 1, 2, 6, 24, 120, 720, 5040, 40320, 362880, 1814400, 13305600, 119750400, 1245404160, 14529715200, 186810624000, 2615348736000, 39520825344000, 640237370572800, 6082255020441600, 81096733605888000, 1277273554292736000, 22480014555552153600
OFFSET
0,4
LINKS
Wikipedia, D-ary heap
CROSSREFS
Column k=9 of A273693.
Sequence in context: A062919 A319211 A276843 * A177280 A173849 A154657
KEYWORD
nonn
AUTHOR
Alois P. Heinz, May 28 2016
STATUS
approved