A178011 Number of permutations of 1..n with no element e[i>=2]<e[1+floor((i-2)/6)] (6-way heap).

1, 1, 1, 2, 6, 24, 120, 720, 2520, 13440, 90720, 725760, 6652800, 68428800, 444787200, 4151347200, 46702656000, 597793996800, 8468748288000, 130660687872000, 1241276534784000, 16550353797120000, 260668072304640000, 4587758072561664000, 87932029724098560000

Offset

0,4

Links

Alois P. Heinz, Table of n, a(n) for n = 0..479

Wikipedia, D-ary heap

Crossrefs

Simple 2-way heap A056971.

Column k=6 of A273693.

Sequence in context: A263745 A276840 A364426 * A189853 A189857 A189860

Adjacent sequences: A178008 A178009 A178010 * A178012 A178013 A178014

Keyword

nonn

Author

R. H. Hardin, May 17 2010

Extensions

a(0), a(21)-a(24) from Alois P. Heinz, May 27 2016

Status

approved