A152666 - cp's OEIS frontend

A152666 Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k runs of odd entries (1<=k<=ceiling(n/2)). For example, the permutation 321756498 has 3 runs of odd entries: 3, 175 and 9.

n	a(n)
1	1
2	2
3	4
4	2
5	12
6	12
7	36
8	72
9	12
10	144
11	432
12	144
13	576
14	2592
15	1728
16	144
17	2880
18	17280
19	17280
20	2880
21	14400
22	115200
23	172800
24	57600
25	2880
26	86400
27	864000
28	1728000
29	864000
30	86400
31	518400
32	6480000
33	17280000
34	12960000
35	2592000
36	86400
37	3628800
38	54432000

[1, 2, 4, 2, 12, 12, 36, 72, 12, 144, 432, 144, 576, 2592, 1728, 144, 2880, 17280, 17280, 2880, 14400, 115200, 172800, 57600, 2880, 86400, 864000, 1728000, 864000, 86400, 518400, 6480000, 17280000, 12960000, 2592000, 86400, 3628800, 54432000]

cp's OEIS Frontend

A152666 Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k runs of odd entries (1<=k<=ceiling(n/2)). For example, the permutation 321756498 has 3 runs of odd entries: 3, 175 and 9.

Table of values

List of values