A064060 - cp's OEIS frontend

A064060 Number of connected, homeomorphically irreducible (also called series-reduced) trees with n >= 2 labeled leaves (numbers in nondecreasing order).

n	a(n)
2	1
3	1
4	1
5	3
6	1
7	10
8	15
9	1
10	10
11	15
12	15
13	45
14	60
15	90
16	1
17	21
18	35
19	70
20	105
21	105
22	105
23	105
24	210
25	315
26	420
27	630
28	630
29	1
30	28
31	35
32	56
33	105
34	168
35	210
36	210
37	280
38	280
39	280
40	315
41	420
42	420
43	560
44	560
45	840
46	840
47	840
48	1260
49	1260

[1, 1, 1, 3, 1, 10, 15, 1, 10, 15, 15, 45, 60, 90, 1, 21, 35, 70, 105, 105, 105, 105, 210, 315, 420, 630, 630, 1, 28, 35, 56, 105, 168, 210, 210, 280, 280, 280, 315, 420, 420, 560, 560, 840, 840, 840, 1260, 1260]

cp's OEIS Frontend

A064060 Number of connected, homeomorphically irreducible (also called series-reduced) trees with n >= 2 labeled leaves (numbers in nondecreasing order).

Table of values

List of values