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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..472

Wikipedia, D-ary heap

CROSSREFS

Column k=9 of A273693.

Sequence in context: A062919 A319211 A276843 * A177280 A173849 A154657

Adjacent sequences:  A273693 A273694 A273695 * A273697 A273698 A273699

KEYWORD

nonn

AUTHOR

Alois P. Heinz, May 28 2016

STATUS

approved

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Last modified March 30 09:22 EDT 2020. Contains 333125 sequences. (Running on oeis4.)