A152660 - cp's OEIS frontend

A152660 Triangle read by rows: T(n,k) is the number of permutations of [n] for which k is the maximal number of initial entries whose parities alternate (1 <= k <= n).

n	a(n)
1	1
2	0
3	2
4	2
5	2
6	2
7	8
8	8
9	0
10	8
11	48
12	36
13	12
14	12
15	12
16	288
17	216
18	72
19	72
20	0
21	72
22	2160
23	1440
24	576
25	432
26	144
27	144
28	144
29	17280
30	11520
31	4608
32	3456
33	1152
34	1152
35	0
36	1152
37	161280
38	100800
39	43200
40	28800
41	11520
42	8640
43	2880
44	2880
45	2880
46	1612800
47	1008000
48	432000
49	288000
50	115200
51	86400
52	28800
53	28800
54	0
55	28800

[1, 0, 2, 2, 2, 2, 8, 8, 0, 8, 48, 36, 12, 12, 12, 288, 216, 72, 72, 0, 72, 2160, 1440, 576, 432, 144, 144, 144, 17280, 11520, 4608, 3456, 1152, 1152, 0, 1152, 161280, 100800, 43200, 28800, 11520, 8640, 2880, 2880, 2880, 1612800, 1008000, 432000, 288000, 115200, 86400, 28800, 28800, 0, 28800]

cp's OEIS Frontend

A152660 Triangle read by rows: T(n,k) is the number of permutations of [n] for which k is the maximal number of initial entries whose parities alternate (1 <= k <= n).

Table of values

List of values