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A273723 Number of ternary heaps on n levels (i.e., of (3^n-1)/2 elements). 2
1, 1, 6, 7484400, 35417271278873496315860673177600000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..6

Wikipedia, D-ary heap

FORMULA

a(n) = A178008(A003462(n)).

CROSSREFS

Column k=3 of A273712.

Cf. A003462, A178008.

Sequence in context: A172876 A269516 A116272 * A182792 A067484 A193150

Adjacent sequences:  A273720 A273721 A273722 * A273724 A273725 A273726

KEYWORD

nonn

AUTHOR

Alois P. Heinz, May 28 2016

STATUS

approved

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Last modified November 18 14:59 EST 2019. Contains 329262 sequences. (Running on oeis4.)