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A241798
Number of ballot sequences of length n having exactly five descents.
2
4, 112, 1615, 15403, 112106, 672015, 3477691, 16037089, 67235292, 260887532, 946435074, 3246205986, 10587385911, 33085654876, 99411959668, 288773319190, 812777159786, 2225529375130, 5937743304924, 15483111029378, 39503358108034, 98849770060367, 242801184657314
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OFFSET
9,1
LINKS
Table of n, a(n) for n=9..31.
EXAMPLE
a(9) = 4: [1,2,1,3,2,1,3,2,1], [1,2,1,3,2,1,4,2,1], [1,2,1,3,2,1,4,3,1], [1,2,1,3,2,1,4,3,2].
CROSSREFS
Column k=5 of
A238121
and of
A238122
.
Sequence in context:
A212655
A181485
A135917
*
A158450
A063406
A361543
Adjacent sequences:
A241795
A241796
A241797
*
A241799
A241800
A241801
KEYWORD
nonn
AUTHOR
Joerg Arndt
and
Alois P. Heinz
, Apr 28 2014
STATUS
approved
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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)