A319541 - cp's OEIS frontend

A319541 Triangle read by rows: T(n,k) is the number of binary rooted trees with n leaves of exactly k colors and all non-leaf nodes having out-degree 2.

n	a(n)
1	1
2	1
3	1
4	1
5	4
6	3
7	2
8	14
9	27
10	15
11	3
12	48
13	180
14	240
15	105
16	6
17	171
18	1089
19	2604
20	2625
21	945
22	11
23	614
24	6333
25	24180
26	42075
27	34020
28	10395
29	23
30	2270
31	36309
32	207732
33	554820
34	755370
35	509355
36	135135
37	46
38	8518
39	207255
40	1710108
41	6578550
42	13408740
43	14963130
44	8648640
45	2027025

[1, 1, 1, 1, 4, 3, 2, 14, 27, 15, 3, 48, 180, 240, 105, 6, 171, 1089, 2604, 2625, 945, 11, 614, 6333, 24180, 42075, 34020, 10395, 23, 2270, 36309, 207732, 554820, 755370, 509355, 135135, 46, 8518, 207255, 1710108, 6578550, 13408740, 14963130, 8648640, 2027025]

cp's OEIS Frontend

A319541 Triangle read by rows: T(n,k) is the number of binary rooted trees with n leaves of exactly k colors and all non-leaf nodes having out-degree 2.

Table of values

List of values