A136715 - cp's OEIS frontend

A136715 Triangle T(n,k), 1 <= k <= n, read by rows: T(n,k) is the number of permutations of the set {2,4,6,...,2n} with k excedances. Equivalently, T(n,k) is the number of permutations in the symmetric group S_n having k multiplicative 2-excedances.

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

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

cp's OEIS Frontend

A136715 Triangle T(n,k), 1 <= k <= n, read by rows: T(n,k) is the number of permutations of the set {2,4,6,...,2n} with k excedances. Equivalently, T(n,k) is the number of permutations in the symmetric group S_n having k multiplicative 2-excedances.

Table of values

List of values