A187246 - cp's OEIS frontend

A187246 Number of cycles with 2 alternating runs in all permutations of [n] (it is assumed that the smallest element of the cycle is in the first position).

n	a(n)
0	0
1	0
2	0
3	1
4	7
5	42
6	267
7	1900
8	15263
9	137494
10	1375195
11	15127656
12	181532895
13	2359929682
14	33039019643
15	495585302836
16	7929364861759
17	134799202682670
18	2426385648353595
19	46101327318849376
20	922026546377249663
21	19362557473922767210
22	425976264426301927195

[0, 0, 0, 1, 7, 42, 267, 1900, 15263, 137494, 1375195, 15127656, 181532895, 2359929682, 33039019643, 495585302836, 7929364861759, 134799202682670, 2426385648353595, 46101327318849376, 922026546377249663, 19362557473922767210, 425976264426301927195]

cp's OEIS Frontend

A187246 Number of cycles with 2 alternating runs in all permutations of [n] (it is assumed that the smallest element of the cycle is in the first position).

Table of values

List of values