A339285 - cp's OEIS frontend

A339285 Triangle read by rows: T(n,k) is the number of unoriented series-parallel networks whose multigraph has n edges and k interior vertices, 0 <= k < n.

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	1
8	4
9	5
10	1
11	1
12	6
13	14
14	8
15	1
16	1
17	9
18	34
19	39
20	14
21	1
22	1
23	12
24	68
25	132
26	94
27	20
28	1
29	1
30	16
31	126
32	370
33	447
34	202
35	30
36	1
37	1
38	20
39	212
40	887
41	1625
42	1275
43	398
44	40
45	1
46	1
47	25
48	340
49	1911
50	4955
51	5985
52	3284
53	730
54	55
55	1
56	1
57	30
58	515
59	3765
60	13133
61	22608
62	19245
63	7649
64	1266
65	70
66	1

[1, 1, 1, 1, 2, 1, 1, 4, 5, 1, 1, 6, 14, 8, 1, 1, 9, 34, 39, 14, 1, 1, 12, 68, 132, 94, 20, 1, 1, 16, 126, 370, 447, 202, 30, 1, 1, 20, 212, 887, 1625, 1275, 398, 40, 1, 1, 25, 340, 1911, 4955, 5985, 3284, 730, 55, 1, 1, 30, 515, 3765, 13133, 22608, 19245, 7649, 1266, 70, 1]

cp's OEIS Frontend

A339285 Triangle read by rows: T(n,k) is the number of unoriented series-parallel networks whose multigraph has n edges and k interior vertices, 0 <= k < n.

Table of values

List of values