A320221 - cp's OEIS frontend

A320221 Irregular triangle where T(n,k) is the number of unlabeled series-reduced rooted trees with n leaves in which every leaf is at height k, (n>=1, min(1,n-1) <= k <= log_2(n)).

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	3
10	1
11	3
12	1
13	6
14	1
15	1
16	7
17	1
18	1
19	11
20	4
21	1
22	13
23	6
24	1
25	20
26	16
27	1
28	23
29	23
30	1
31	33
32	46
33	1
34	40
35	70
36	1
37	54
38	127
39	1
40	1
41	65
42	189
43	1
44	1
45	87
46	320
47	5
48	1
49	104
50	476
51	10
52	1
53	136
54	771
55	32
56	1
57	164
58	1145
59	63
60	1
61	209
62	1795
63	154
64	1
65	252
66	2657
67	304
68	1
69	319
70	4091
71	656

[1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 3, 1, 6, 1, 1, 7, 1, 1, 11, 4, 1, 13, 6, 1, 20, 16, 1, 23, 23, 1, 33, 46, 1, 40, 70, 1, 54, 127, 1, 1, 65, 189, 1, 1, 87, 320, 5, 1, 104, 476, 10, 1, 136, 771, 32, 1, 164, 1145, 63, 1, 209, 1795, 154, 1, 252, 2657, 304, 1, 319, 4091, 656]

cp's OEIS Frontend

A320221 Irregular triangle where T(n,k) is the number of unlabeled series-reduced rooted trees with n leaves in which every leaf is at height k, (n>=1, min(1,n-1) <= k <= log_2(n)).

Table of values

List of values