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A178011
Number of permutations of 1..n with no element e[i>=2]<e[1+floor((i-2)/6)] (6-way heap).
3
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
Wikipedia, D-ary heap
CROSSREFS
Simple 2-way heap A056971.
Column k=6 of A273693.
Sequence in context: A263745 A276840 A364426 * A189853 A189857 A189860
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