A213262 - cp's OEIS frontend

A213262 Triangle read by rows: R(n,k) (n>=2, k from 2 to n-1 or to 2 if n = 2), where R(n,k) = number of trees with n nodes and k unlabeled end-nodes.

n	a(n)
2	1
3	1
4	1
5	1
6	3
7	2
8	1
9	12
10	9
11	3
12	1
13	60
14	52
15	18
16	4
17	1
18	360
19	360
20	136
21	30
22	5
23	1
24	2520
25	2880
26	1205
27	280
28	45
29	6
30	1
31	20160
32	26040
33	12090
34	3025
35	500
36	63
37	7
38	1
39	181440
40	262080
41	134610
42	36546
43	6375
44	812
45	84
46	8
47	1
48	1814400
49	2903040
50	1641360
51	484260
52	90126
53	11935
54	1232
55	108
56	9
57	1
58	19958400
59	35078400
60	21712320
61	6951840
62	1386217
63	193326
64	20510
65	1776
66	135
67	10
68	1

[1, 1, 1, 1, 3, 2, 1, 12, 9, 3, 1, 60, 52, 18, 4, 1, 360, 360, 136, 30, 5, 1, 2520, 2880, 1205, 280, 45, 6, 1, 20160, 26040, 12090, 3025, 500, 63, 7, 1, 181440, 262080, 134610, 36546, 6375, 812, 84, 8, 1, 1814400, 2903040, 1641360, 484260, 90126, 11935, 1232, 108, 9, 1, 19958400, 35078400, 21712320, 6951840, 1386217, 193326, 20510, 1776, 135, 10, 1]

cp's OEIS Frontend

A213262 Triangle read by rows: R(n,k) (n>=2, k from 2 to n-1 or to 2 if n = 2), where R(n,k) = number of trees with n nodes and k unlabeled end-nodes.

Table of values

List of values

cp's OEIS Frontend

A213262 Triangle read by rows: R*(n,k) (n>=2, k from 2 to n-1 or to 2 if n = 2), where R*(n,k) = number of trees with n nodes and k unlabeled end-nodes.

Table of values

List of values

A213262 Triangle read by rows: R(n,k) (n>=2, k from 2 to n-1 or to 2 if n = 2), where R(n,k) = number of trees with n nodes and k unlabeled end-nodes.