A241798 Number of ballot sequences of length n having exactly five descents.

4, 112, 1615, 15403, 112106, 672015, 3477691, 16037089, 67235292, 260887532, 946435074, 3246205986, 10587385911, 33085654876, 99411959668, 288773319190, 812777159786, 2225529375130, 5937743304924, 15483111029378, 39503358108034, 98849770060367, 242801184657314

Offset: 9

Author

Joerg Arndt and Alois P. Heinz, Apr 28 2014

Keywords

• nonn

Examples

			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.