A339231 - cp's OEIS frontend

A339231 Triangle read by rows: T(n,k) is the number of oriented 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	3
6	1
7	1
8	6
9	7
10	1
11	1
12	10
13	23
14	13
15	1
16	1
17	15
18	59
19	69
20	22
21	1
22	1
23	21
24	124
25	249
26	172
27	34
28	1
29	1
30	28
31	234
32	711
33	853
34	378
35	50
36	1
37	1
38	36
39	402
40	1733
41	3175
42	2487
43	755
44	70
45	1
46	1
47	45
48	650
49	3755
50	9767
51	11813
52	6431
53	1400
54	95
55	1
56	1
57	55
58	995
59	7443
60	26043
61	44926
62	38160
63	15098
64	2445
65	125
66	1

[1, 1, 1, 1, 3, 1, 1, 6, 7, 1, 1, 10, 23, 13, 1, 1, 15, 59, 69, 22, 1, 1, 21, 124, 249, 172, 34, 1, 1, 28, 234, 711, 853, 378, 50, 1, 1, 36, 402, 1733, 3175, 2487, 755, 70, 1, 1, 45, 650, 3755, 9767, 11813, 6431, 1400, 95, 1, 1, 55, 995, 7443, 26043, 44926, 38160, 15098, 2445, 125, 1]

cp's OEIS Frontend

A339231 Triangle read by rows: T(n,k) is the number of oriented series-parallel networks whose multigraph has n edges and k interior vertices, 0 <= k < n.

Table of values

List of values