A129178 - cp's OEIS frontend

A129178 Triangle read by rows: T(n,k) is the number of permutations p of {1,2,...,n} such that invc(p)=k (n >= 0; 0 <= k <= (n-1)(n-2)/2) (see comment for invc definition).

n	a(n)
0	1
1	1
2	2
3	4
4	2
5	8
6	8
7	6
8	2
9	16
10	24
11	28
12	26
13	16
14	8
15	2
16	32
17	64
18	96
19	120
20	126
21	110
22	82
23	52
24	26
25	10
26	2
27	64
28	160
29	288
30	432
31	564
32	658
33	680
34	638
35	542
36	416
37	284
38	172
39	90
40	38
41	12
42	2
43	128
44	384
45	800
46	1376
47	2072
48	2824
49	3526
50	4058
51	4344
52	4346
53	4066
54	3562
55	2912
56	2218
57	1566
58	1016
59	598

[1, 1, 2, 4, 2, 8, 8, 6, 2, 16, 24, 28, 26, 16, 8, 2, 32, 64, 96, 120, 126, 110, 82, 52, 26, 10, 2, 64, 160, 288, 432, 564, 658, 680, 638, 542, 416, 284, 172, 90, 38, 12, 2, 128, 384, 800, 1376, 2072, 2824, 3526, 4058, 4344, 4346, 4066, 3562, 2912, 2218, 1566, 1016, 598]

cp's OEIS Frontend

A129178 Triangle read by rows: T(n,k) is the number of permutations p of {1,2,...,n} such that invc(p)=k (n >= 0; 0 <= k <= (n-1)(n-2)/2) (see comment for invc definition).

Table of values

List of values