A000671 - cp's OEIS frontend

A000671 Number of boron trees with n nodes, i.e. n-node rooted trees with degree <= 3 at root and out-degree <= 2 elsewhere.

n	a(n)
0	0
1	1
2	1
3	2
4	4
5	7
6	14
7	29
8	60
9	127
10	275
11	598
12	1320
13	2936
14	6584
15	14858
16	33744
17	76999
18	176557
19	406456
20	939241
21	2177573
22	5064150
23	11809632
24	27610937
25	64705623
26	151966597
27	357623905
28	843176524
29	1991439229
30	4711115672
31	11162025770
32	26484061667
33	62923251955

[0, 1, 1, 2, 4, 7, 14, 29, 60, 127, 275, 598, 1320, 2936, 6584, 14858, 33744, 76999, 176557, 406456, 939241, 2177573, 5064150, 11809632, 27610937, 64705623, 151966597, 357623905, 843176524, 1991439229, 4711115672, 11162025770, 26484061667, 62923251955]

cp's OEIS Frontend

A000671 Number of boron trees with n nodes, i.e. n-node rooted trees with degree <= 3 at root and out-degree <= 2 elsewhere.

Table of values

List of values