A145883 - cp's OEIS frontend

A145883 Triangle read by rows: T(n,k) is the number of odd permutations of {1,2,...,n} having k descents. (n>=1, k>=1).

n	a(n)
1	0
2	1
3	2
4	1
5	6
6	6
7	12
8	36
9	12
10	28
11	155
12	147
13	29
14	1
15	56
16	605
17	1208
18	586
19	64
20	1
21	120
22	2160
23	7800
24	7800
25	2160
26	120
27	240
28	7320
29	44160
30	78000
31	44160
32	7320
33	240
34	496
35	23947
36	227623
37	655039
38	655315
39	227569
40	23893
41	517
42	1
43	992
44	76305
45	1102068
46	4868556

[0, 1, 2, 1, 6, 6, 12, 36, 12, 28, 155, 147, 29, 1, 56, 605, 1208, 586, 64, 1, 120, 2160, 7800, 7800, 2160, 120, 240, 7320, 44160, 78000, 44160, 7320, 240, 496, 23947, 227623, 655039, 655315, 227569, 23893, 517, 1, 992, 76305, 1102068, 4868556]

cp's OEIS Frontend

A145883 Triangle read by rows: T(n,k) is the number of odd permutations of {1,2,...,n} having k descents. (n>=1, k>=1).

Table of values

List of values