A241799 Number of ballot sequences of length n having exactly six descents.

1, 66, 1582, 21895, 215849, 1685957, 11051141, 63115364, 322683730, 1503863212, 6488505684, 26177296409, 99733640537, 361023920432, 1250117445742, 4157235614630, 13341716405949, 41433896651428, 124970671492315, 366791960890982, 1050487889623924

Offset: 10

Author

Joerg Arndt and Alois P. Heinz, Apr 28 2014

Keywords

• nonn

Examples

			a(10) = 1: [1,2,1,3,2,1,4,3,2,1].
		

Crossrefs

Column k=6 of A238121 and of A238122.