A357885 - cp's OEIS frontend

A357885 Triangle read by rows: T(n,k) = number of closed trails of length k starting and ending at a fixed vertex in the complete undirected graph on n labeled vertices, for n >= 1 and k = 0 .. n(n-1)/2.

n	a(n)
1	1
2	1
3	0
4	1
5	0
6	0
7	2
8	1
9	0
10	0
11	6
12	6
13	0
14	0
15	1
16	0
17	0
18	12
19	24
20	24
21	72
22	168
23	0
24	0
25	528
26	1
27	0
28	0
29	20
30	60
31	120
32	480
33	1680
34	3120
35	5760
36	15840
37	29040
38	22320
39	0
40	0
41	0
42	1
43	0
44	0
45	30
46	120
47	360
48	1800
49	8280
50	27360
51	88560
52	310320
53	934560
54	2296800
55	5541120
56	12965760
57	21837600
58	27740160
59	58752000
60	101882880
61	0
62	0
63	389928960

[1, 1, 0, 1, 0, 0, 2, 1, 0, 0, 6, 6, 0, 0, 1, 0, 0, 12, 24, 24, 72, 168, 0, 0, 528, 1, 0, 0, 20, 60, 120, 480, 1680, 3120, 5760, 15840, 29040, 22320, 0, 0, 0, 1, 0, 0, 30, 120, 360, 1800, 8280, 27360, 88560, 310320, 934560, 2296800, 5541120, 12965760, 21837600, 27740160, 58752000, 101882880, 0, 0, 389928960]

cp's OEIS Frontend

A357885 Triangle read by rows: T(n,k) = number of closed trails of length k starting and ending at a fixed vertex 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