A273731 Number of permutations of n elements divided by the number of ternary heaps on n+1 elements.

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

Offset: 0

Author

Alois P. Heinz, May 28 2016

Keywords

• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..1000
• Wikipedia, D-ary heap

Crossrefs

Column k=3 of A273730.

Cf. A000142, A178008.

Formula

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