A357886 - cp's OEIS frontend

A357886 Triangle read by rows: T(n,k) = number of open trails of length k starting and ending at fixed distinct vertices in the complete undirected graph on n labeled vertices, for n >= 1 and k = 0 .. n*(n-1)/2.

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	1
7	0
8	0
9	1
10	2
11	2
12	4
13	6
14	0
15	0
16	1
17	3
18	6
19	18
20	48
21	78
22	96
23	132
24	132
25	0
26	0
27	1
28	4
29	12
30	48
31	180
32	528
33	1392
34	3600
35	7920
36	13680
37	21840
38	31872
39	25008
40	0
41	0
42	0
43	1
44	5
45	20
46	100
47	480
48	1980
49	7680
50	29040
51	100920
52	316320
53	923520
54	2502000
55	6011760
56	12584880
57	23417280
58	38196480
59	50112000
60	53667840
61	64988160
62	64988160
63	0

[0, 0, 1, 0, 1, 1, 0, 0, 1, 2, 2, 4, 6, 0, 0, 1, 3, 6, 18, 48, 78, 96, 132, 132, 0, 0, 1, 4, 12, 48, 180, 528, 1392, 3600, 7920, 13680, 21840, 31872, 25008, 0, 0, 0, 1, 5, 20, 100, 480, 1980, 7680, 29040, 100920, 316320, 923520, 2502000, 6011760, 12584880, 23417280, 38196480, 50112000, 53667840, 64988160, 64988160, 0]

cp's OEIS Frontend

A357886 Triangle read by rows: T(n,k) = number of open trails of length k starting and ending at fixed distinct vertices in the complete undirected graph on n labeled vertices, for n >= 1 and k = 0 .. n*(n-1)/2.

Table of values

List of values