Location via proxy:
[ UP ]
[Report a bug]
[Manage cookies]
No cookies
No scripts
No ads
No referrer
Show this form
login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A178018
Number of permutations of 3 copies of 1..n with no element e[i>=2]<e[1+floor((i-2)/3)] (3-way heap)
0
1, 5, 94, 4480, 332680, 44019800, 10480204080, 3225666791760, 1530272351292180
(
list
;
graph
;
refs
;
listen
;
history
;
text
;
internal format
)
OFFSET
1,2
LINKS
Table of n, a(n) for n=1..9.
CROSSREFS
Simple 2-way heap
A056971
Sequence in context:
A047052
A049662
A264176
*
A195854
A153227
A116159
Adjacent sequences:
A178015
A178016
A178017
*
A178019
A178020
A178021
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 17 2010
STATUS
approved
Lookup
|
Welcome
|
Wiki
|
Register
|
Music
|
Plot 2
|
Demos
|
Index
|
Browse
|
More
|
WebCam
Contribute new seq. or comment
|
Format
|
Style Sheet
|
Transforms
|
Superseeker
|
Recents
The OEIS Community
| Maintained by
The OEIS Foundation Inc.
License Agreements, Terms of Use, Privacy Policy.
.
Last modified August 18 10:08 EDT 2024. Contains 375264 sequences. (Running on oeis4.)