A178011 Number of permutations of 1..n with no element e[i>=2]

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

Author

R. H. Hardin, May 17 2010

Keywords

• nonn

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.

Extensions

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