A152874 - cp's OEIS frontend

A152874 Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} with k parity changes (n>=2; 1<=k <=n-1); the permutation 372185946 has 5 parity changes: 37-2-1-8-59-46.

n	a(n)
2	2
3	4
4	2
5	8
6	8
7	8
8	24
9	36
10	48
11	12
12	72
13	144
14	288
15	144
16	72
17	288
18	720
19	1728
20	1296
21	864
22	144
23	1152
24	3456
25	10368
26	10368
27	10368
28	3456
29	1152
30	5760
31	20160
32	69120
33	86400
34	103680
35	51840
36	23040
37	2880
38	28800
39	115200
40	460800
41	691200
42	1036800
43	691200
44	460800
45	115200
46	28800

[2, 4, 2, 8, 8, 8, 24, 36, 48, 12, 72, 144, 288, 144, 72, 288, 720, 1728, 1296, 864, 144, 1152, 3456, 10368, 10368, 10368, 3456, 1152, 5760, 20160, 69120, 86400, 103680, 51840, 23040, 2880, 28800, 115200, 460800, 691200, 1036800, 691200, 460800, 115200, 28800]

cp's OEIS Frontend

A152874 Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} with k parity changes (n>=2; 1<=k <=n-1); the permutation 372185946 has 5 parity changes: 37-2-1-8-59-46.

Table of values

List of values