A145893 - cp's OEIS frontend

A145893 Triangle read by rows: T(n,k) is the number of permutations p of {1,2,...,n} such that j and p(j) are of opposite parities for k values of j (0<=k<=n).

n	a(n)
0	1
1	1
2	0
3	1
4	0
5	1
6	2
7	0
8	4
9	0
10	4
11	0
12	16
13	0
14	4
15	12
16	0
17	72
18	0
19	36
20	0
21	36
22	0
23	324
24	0
25	324
26	0
27	36
28	144
29	0
30	1728
31	0
32	2592
33	0
34	576
35	0
36	576
37	0
38	9216
39	0
40	20736
41	0
42	9216
43	0
44	576
45	2880
46	0
47	57600
48	0
49	172800
50	0
51	115200
52	0
53	14400
54	0
55	14400
56	0
57	360000
58	0
59	1440000
60	0
61	1440000
62	0
63	360000
64	0
65	14400

[1, 1, 0, 1, 0, 1, 2, 0, 4, 0, 4, 0, 16, 0, 4, 12, 0, 72, 0, 36, 0, 36, 0, 324, 0, 324, 0, 36, 144, 0, 1728, 0, 2592, 0, 576, 0, 576, 0, 9216, 0, 20736, 0, 9216, 0, 576, 2880, 0, 57600, 0, 172800, 0, 115200, 0, 14400, 0, 14400, 0, 360000, 0, 1440000, 0, 1440000, 0, 360000, 0, 14400]

cp's OEIS Frontend

A145893 Triangle read by rows: T(n,k) is the number of permutations p of {1,2,...,n} such that j and p(j) are of opposite parities for k values of j (0<=k<=n).

Table of values

List of values