A152664 - cp's OEIS frontend

A152664 Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} for which k is the maximal number of initial even entries (0 <= k <= floor(n/2)).

n	a(n)
1	1
2	1
3	1
4	4
5	2
6	12
7	8
8	4
9	72
10	36
11	12
12	360
13	216
14	108
15	36
16	2880
17	1440
18	576
19	144
20	20160
21	11520
22	5760
23	2304
24	576
25	201600
26	100800
27	43200
28	14400
29	2880
30	1814400
31	1008000
32	504000
33	216000
34	72000
35	14400
36	21772800
37	10886400
38	4838400
39	1814400
40	518400
41	86400

[1, 1, 1, 4, 2, 12, 8, 4, 72, 36, 12, 360, 216, 108, 36, 2880, 1440, 576, 144, 20160, 11520, 5760, 2304, 576, 201600, 100800, 43200, 14400, 2880, 1814400, 1008000, 504000, 216000, 72000, 14400, 21772800, 10886400, 4838400, 1814400, 518400, 86400]

cp's OEIS Frontend

A152664 Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} for which k is the maximal number of initial even entries (0 <= k <= floor(n/2)).

Table of values

List of values