login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A241797
Number of ballot sequences of length n having exactly four descents.
2
9, 146, 1324, 8786, 47013, 214997, 874413, 3228005, 11049817, 35389760, 107476721, 310853113, 863984856, 2313084483, 6003120701, 15122836712, 37154716734, 89093938147, 209258012995, 481663102867, 1089445474512, 2422311605452, 5305675093522, 11451261202545
(
list
;
graph
;
refs
;
listen
;
history
;
text
;
internal format
)
OFFSET
8,1
LINKS
Table of n, a(n) for n=8..31.
EXAMPLE
a(8) = 9: [1,2,1,2,1,3,2,1], [1,2,1,3,1,4,2,1], [1,2,1,3,2,1,2,1], [1,2,1,3,2,1,3,1], [1,2,1,3,2,1,3,2], [1,2,1,3,2,1,4,1], [1,2,1,3,2,1,4,2], [1,2,1,3,2,1,4,3], [1,2,1,3,2,4,3,1].
CROSSREFS
Column k=4 of
A238121
and of
A238122
.
Sequence in context:
A178185
A244822
A299319
*
A222439
A211106
A006691
Adjacent sequences:
A241794
A241795
A241796
*
A241798
A241799
A241800
KEYWORD
nonn
AUTHOR
Joerg Arndt
and
Alois P. Heinz
, Apr 28 2014
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 April 17 23:23 EDT 2024. Contains 371767 sequences. (Running on oeis4.)