A145224 - cp's OEIS frontend

A145224 Triangle read by rows: T(n,k) is the number of even permutations (of an n-set) with exactly k fixed points.

n	a(n)
0	1
1	0
2	1
3	0
4	0
5	1
6	2
7	0
8	0
9	1
10	3
11	8
12	0
13	0
14	1
15	24
16	15
17	20
18	0
19	0
20	1
21	130
22	144
23	45
24	40
25	0
26	0
27	1
28	930
29	910
30	504
31	105
32	70
33	0
34	0
35	1
36	7413
37	7440
38	3640
39	1344
40	210
41	112
42	0
43	0
44	1
45	66752
46	66717
47	33480
48	10920
49	3024
50	378
51	168
52	0
53	0
54	1

[1, 0, 1, 0, 0, 1, 2, 0, 0, 1, 3, 8, 0, 0, 1, 24, 15, 20, 0, 0, 1, 130, 144, 45, 40, 0, 0, 1, 930, 910, 504, 105, 70, 0, 0, 1, 7413, 7440, 3640, 1344, 210, 112, 0, 0, 1, 66752, 66717, 33480, 10920, 3024, 378, 168, 0, 0, 1]

cp's OEIS Frontend

A145224 Triangle read by rows: T(n,k) is the number of even permutations (of an n-set) with exactly k fixed points.

Table of values

List of values