A241801 Number of ballot sequences of length n having exactly eight descents.

14, 932, 26865, 486170, 6385041, 66251021, 572940736, 4284412169, 28422470746, 170581304048, 939549814317, 4806572652156, 23042550110214, 104344981470162, 448963898693786, 1845829609158989, 7281093726825326, 27670464821261399, 101613723592257039

Offset: 13

Author

Joerg Arndt and Alois P. Heinz, Apr 28 2014

Keywords

• nonn

Examples

			a(13) = 14: [1,2,1,3,2,1,3,2,1,4,3,2,1], [1,2,1,3,2,1,4,2,1,5,3,2,1], [1,2,1,3,2,1,4,3,1,5,4,2,1], [1,2,1,3,2,1,4,3,2,1,3,2,1], [1,2,1,3,2,1,4,3,2,1,4,2,1], [1,2,1,3,2,1,4,3,2,1,4,3,1], [1,2,1,3,2,1,4,3,2,1,4,3,2], [1,2,1,3,2,1,4,3,2,1,5,2,1], [1,2,1,3,2,1,4,3,2,1,5,3,1], [1,2,1,3,2,1,4,3,2,1,5,3,2], [1,2,1,3,2,1,4,3,2,1,5,4,1], [1,2,1,3,2,1,4,3,2,1,5,4,2], [1,2,1,3,2,1,4,3,2,1,5,4,3], [1,2,1,3,2,1,4,3,2,5,4,3,1].
		

Crossrefs

Column k=8 of A238121 and of A238122.