A161134 - cp's OEIS frontend

A161134 Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having exactly k even fixed points (0 <= k <= floor(n/2)).

n	a(n)
0	1
1	1
2	1
3	1
4	4
5	2
6	14
7	8
8	2
9	78
10	36
11	6
12	426
13	234
14	54
15	6
16	3216
17	1512
18	288
19	24
20	24024
21	12864
22	3024
23	384
24	24
25	229080
26	108960
27	22320
28	2400
29	120
30	2170680
31	1145400
32	272400
33	37200
34	3000
35	120
36	25022880
37	11998800
38	2563200
39	309600
40	21600
41	720
42	287250480

[1, 1, 1, 1, 4, 2, 14, 8, 2, 78, 36, 6, 426, 234, 54, 6, 3216, 1512, 288, 24, 24024, 12864, 3024, 384, 24, 229080, 108960, 22320, 2400, 120, 2170680, 1145400, 272400, 37200, 3000, 120, 25022880, 11998800, 2563200, 309600, 21600, 720, 287250480]

cp's OEIS Frontend

A161134 Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having exactly k even fixed points (0 <= k <= floor(n/2)).

Table of values

List of values