A187247 - cp's OEIS frontend

A187247 Triangle read by rows: T(n,k) is the number of permutations of [n] having k cycles with at most 2 alternating runs (it is assumed that the smallest element of the cycle is in the first position), 0<=k<=n.

n	a(n)
0	1
1	0
2	1
3	0
4	1
5	1
6	0
7	2
8	3
9	1
10	2
11	4
12	11
13	6
14	1
15	16
16	18
17	40
18	35
19	10
20	1
21	104
22	142
23	178
24	195
25	85
26	15
27	1
28	688
29	1236
30	1106
31	1148
32	665
33	175
34	21
35	1
36	5116
37	10832
38	9300
39	7728
40	5173
41	1820
42	322
43	28
44	1
45	44224
46	98492
47	91680
48	63284
49	42168
50	18165
51	4284
52	546
53	36
54	1
55	438560
56	964172
57	974924
58	627420
59	378620
60	181797
61	53361
62	9030
63	870
64	45
65	1

[1, 0, 1, 0, 1, 1, 0, 2, 3, 1, 2, 4, 11, 6, 1, 16, 18, 40, 35, 10, 1, 104, 142, 178, 195, 85, 15, 1, 688, 1236, 1106, 1148, 665, 175, 21, 1, 5116, 10832, 9300, 7728, 5173, 1820, 322, 28, 1, 44224, 98492, 91680, 63284, 42168, 18165, 4284, 546, 36, 1, 438560, 964172, 974924, 627420, 378620, 181797, 53361, 9030, 870, 45, 1]

cp's OEIS Frontend

A187247 Triangle read by rows: T(n,k) is the number of permutations of [n] having k cycles with at most 2 alternating runs (it is assumed that the smallest element of the cycle is in the first position), 0<=k<=n.

Table of values

List of values