A212258 Number of binary increasing trees with n nodes and "min-path" of length 4.

0, 0, 1, 6, 25, 105, 490, 2548, 14698, 93420, 649715, 4912776, 40154387, 352937312, 3320636540, 33305992320, 354819046132, 4001699525376, 47637151241125, 596958623741440, 7855611484697773, 108314507544748032, 1561635447992241230, 23498865431367684096

Offset

2,4

Links

Table of n, a(n) for n=2..25.

Filippo Disanto, André permutations of the second kind associated to strictly binary increasing trees and left to right minima in their sub-permutations, arXiv preprint arXiv:1202.1139 [math.CO], 2012-2014.

Crossrefs

A diagonal of A186366.

Sequence in context: A029871 A188178 A147543 * A048875 A295202 A346894

Adjacent sequences: A212255 A212256 A212257 * A212259 A212260 A212261

Keyword

nonn

Author

N. J. A. Sloane, May 11 2012

Extensions

More terms from Alois P. Heinz, Apr 03 2014

Status

approved