A145894 - cp's OEIS frontend

A145894 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 the same parity for k values of j (0<=k<=n).

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

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

cp's OEIS Frontend

A145894 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 the same parity for k values of j (0<=k<=n).

Table of values

List of values