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A241799
Number of ballot sequences of length n having exactly six descents.
2
1, 66, 1582, 21895, 215849, 1685957, 11051141, 63115364, 322683730, 1503863212, 6488505684, 26177296409, 99733640537, 361023920432, 1250117445742, 4157235614630, 13341716405949, 41433896651428, 124970671492315, 366791960890982, 1050487889623924
OFFSET
10,2
EXAMPLE
a(10) = 1: [1,2,1,3,2,1,4,3,2,1].
CROSSREFS
Column k=6 of A238121 and of A238122.
Sequence in context: A104673 A251047 A279889 * A269498 A133318 A197645
KEYWORD
nonn
AUTHOR
Joerg Arndt and Alois P. Heinz, Apr 28 2014
STATUS
approved