A161133 - cp's OEIS frontend

A161133 Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having exactly k odd fixed points (0 <= k <= ceiling(n/2)).

n	a(n)
0	1
1	0
2	1
3	1
4	1
5	3
6	2
7	1
8	14
9	8
10	2
11	64
12	42
13	12
14	2
15	426
16	234
17	54
18	6
19	2790
20	1704
21	468
22	72
23	6
24	24024
25	12864
26	3024
27	384
28	24
29	205056
30	120120
31	32160
32	5040
33	480
34	24
35	2170680
36	1145400
37	272400
38	37200
39	3000
40	120
41	22852200
42	13024080
43	3436200
44	544800
45	55800

[1, 0, 1, 1, 1, 3, 2, 1, 14, 8, 2, 64, 42, 12, 2, 426, 234, 54, 6, 2790, 1704, 468, 72, 6, 24024, 12864, 3024, 384, 24, 205056, 120120, 32160, 5040, 480, 24, 2170680, 1145400, 272400, 37200, 3000, 120, 22852200, 13024080, 3436200, 544800, 55800]

cp's OEIS Frontend

A161133 Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having exactly k odd fixed points (0 <= k <= ceiling(n/2)).

Table of values

List of values