A128613 - cp's OEIS frontend

A128613 Triangle T(n,k) read by rows: number of permutations in [n] with exactly k ascents that have an odd number of inversions.

n	a(n)
1	0
2	1
3	0
4	1
5	2
6	0
7	0
8	6
9	6
10	0
11	0
12	12
13	36
14	12
15	0
16	1
17	29
18	147
19	155
20	28
21	0
22	1
23	64
24	586
25	1208
26	605
27	56
28	0
29	0
30	120
31	2160
32	7800
33	7800
34	2160
35	120
36	0
37	0
38	240
39	7320
40	44160
41	78000
42	44160
43	7320
44	240
45	0
46	1
47	517
48	23893
49	227569
50	655315
51	655039
52	227623
53	23947
54	496
55	0
56	1
57	1044
58	76332
59	1101420
60	4869558
61	7862124
62	4868556
63	1102068
64	76305
65	992
66	0

[0, 1, 0, 1, 2, 0, 0, 6, 6, 0, 0, 12, 36, 12, 0, 1, 29, 147, 155, 28, 0, 1, 64, 586, 1208, 605, 56, 0, 0, 120, 2160, 7800, 7800, 2160, 120, 0, 0, 240, 7320, 44160, 78000, 44160, 7320, 240, 0, 1, 517, 23893, 227569, 655315, 655039, 227623, 23947, 496, 0, 1, 1044, 76332, 1101420, 4869558, 7862124, 4868556, 1102068, 76305, 992, 0]

cp's OEIS Frontend

A128613 Triangle T(n,k) read by rows: number of permutations in [n] with exactly k ascents that have an odd number of inversions.

Table of values

List of values