A128612 - cp's OEIS frontend

A128612 Triangle T(n,k) read by rows: number of permutations in [n] with exactly k ascents that have an even number of inversions.

n	a(n)
1	1
2	0
3	1
4	0
5	2
6	1
7	1
8	5
9	5
10	1
11	1
12	14
13	30
14	14
15	1
16	0
17	28
18	155
19	147
20	29
21	1
22	0
23	56
24	605
25	1208
26	586
27	64
28	1
29	1
30	127
31	2133
32	7819
33	7819
34	2133
35	127
36	1
37	1
38	262
39	7288
40	44074
41	78190
42	44074
43	7288
44	262
45	1
46	0
47	496
48	23947
49	227623
50	655039
51	655315
52	227569
53	23893
54	517
55	1
56	0
57	992
58	76305
59	1102068
60	4868556
61	7862124
62	4869558
63	1101420
64	76332
65	1044
66	1

[1, 0, 1, 0, 2, 1, 1, 5, 5, 1, 1, 14, 30, 14, 1, 0, 28, 155, 147, 29, 1, 0, 56, 605, 1208, 586, 64, 1, 1, 127, 2133, 7819, 7819, 2133, 127, 1, 1, 262, 7288, 44074, 78190, 44074, 7288, 262, 1, 0, 496, 23947, 227623, 655039, 655315, 227569, 23893, 517, 1, 0, 992, 76305, 1102068, 4868556, 7862124, 4869558, 1101420, 76332, 1044, 1]

cp's OEIS Frontend

A128612 Triangle T(n,k) read by rows: number of permutations in [n] with exactly k ascents that have an even number of inversions.

Table of values

List of values