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A273725
Number of quaternary heaps on n levels (i.e., of (4^n-1)/3 elements).
2
1, 1, 24, 3892643213082624
OFFSET
0,3
LINKS
Wikipedia, D-ary heap
FORMULA
a(n) = A178009(A002450(n)).
CROSSREFS
Column k=4 of A273712.
Sequence in context: A297424 A013910 A007458 * A072244 A067669 A068741
KEYWORD
nonn
AUTHOR
Alois P. Heinz, May 28 2016
STATUS
approved