A108263 - cp's OEIS frontend

A108263 Triangle read by rows: T(n,k) is the number of short bushes with n edges and k branchnodes (i.e., nodes of outdegree at least two). A short bush is an ordered tree with no nodes of outdegree 1.

n	a(n)
0	1
1	0
2	0
3	1
4	0
5	1
6	0
7	1
8	2
9	0
10	1
11	5
12	0
13	1
14	9
15	5
16	0
17	1
18	14
19	21
20	0
21	1
22	20
23	56
24	14
25	0
26	1
27	27
28	120
29	84
30	0
31	1
32	35
33	225
34	300
35	42
36	0
37	1
38	44
39	385
40	825
41	330
42	0
43	1
44	54
45	616
46	1925
47	1485
48	132
49	0
50	1
51	65
52	936
53	4004
54	5005
55	1287
56	0
57	1
58	77
59	1365
60	7644
61	14014
62	7007
63	429
64	0
65	1
66	90
67	1925
68	13650
69	34398

[1, 0, 0, 1, 0, 1, 0, 1, 2, 0, 1, 5, 0, 1, 9, 5, 0, 1, 14, 21, 0, 1, 20, 56, 14, 0, 1, 27, 120, 84, 0, 1, 35, 225, 300, 42, 0, 1, 44, 385, 825, 330, 0, 1, 54, 616, 1925, 1485, 132, 0, 1, 65, 936, 4004, 5005, 1287, 0, 1, 77, 1365, 7644, 14014, 7007, 429, 0, 1, 90, 1925, 13650, 34398]

cp's OEIS Frontend

A108263 Triangle read by rows: T(n,k) is the number of short bushes with n edges and k branchnodes (i.e., nodes of outdegree at least two). A short bush is an ordered tree with no nodes of outdegree 1.

Table of values

List of values