A211603 - cp's OEIS frontend

A211603 Triangular array read by rows: T(n,k) is the number of n-permutations that are pure cycles having exactly k fixed points; n>=2, 0<=k<=n-2.

n	a(n)
2	1
3	2
4	3
5	6
6	8
7	6
8	24
9	30
10	20
11	10
12	120
13	144
14	90
15	40
16	15
17	720
18	840
19	504
20	210
21	70
22	21
23	5040
24	5760
25	3360
26	1344
27	420
28	112
29	28
30	40320
31	45360
32	25920
33	10080
34	3024
35	756
36	168
37	36
38	362880
39	403200
40	226800
41	86400
42	25200
43	6048
44	1260
45	240
46	45
47	3628800
48	3991680
49	2217600
50	831600
51	237600
52	55440
53	11088
54	1980
55	330
56	55

[1, 2, 3, 6, 8, 6, 24, 30, 20, 10, 120, 144, 90, 40, 15, 720, 840, 504, 210, 70, 21, 5040, 5760, 3360, 1344, 420, 112, 28, 40320, 45360, 25920, 10080, 3024, 756, 168, 36, 362880, 403200, 226800, 86400, 25200, 6048, 1260, 240, 45, 3628800, 3991680, 2217600, 831600, 237600, 55440, 11088, 1980, 330, 55]

cp's OEIS Frontend

A211603 Triangular array read by rows: T(n,k) is the number of n-permutations that are pure cycles having exactly k fixed points; n>=2, 0<=k<=n-2.

Table of values

List of values