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A273731 Number of permutations of n elements divided by the number of ternary heaps on n+1 elements. 2
1, 1, 1, 1, 2, 3, 4, 8, 12, 16, 32, 48, 64, 160, 288, 448, 1024, 1728, 2560, 5632, 9216, 13312, 33280, 59904, 93184, 212992, 359424, 532480, 1171456, 1916928, 2768896, 6922240, 12460032, 19382272, 44302336, 74760192, 110755840, 243662848, 398721024, 575930368 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..1000

Wikipedia, D-ary heap

FORMULA

a(n) = A000142(n)/A178008(n+1).

CROSSREFS

Column k=3 of A273730.

Cf. A000142, A178008.

Sequence in context: A262975 A062923 A133464 * A013914 A228718 A222123

Adjacent sequences:  A273728 A273729 A273730 * A273732 A273733 A273734

KEYWORD

nonn

AUTHOR

Alois P. Heinz, May 28 2016

STATUS

approved

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Last modified June 17 18:04 EDT 2019. Contains 324198 sequences. (Running on oeis4.)