A036657 - cp's OEIS frontend

A036657 Number of n-node rooted unlabeled trees with out-degree <=2 and exactly 2 edges at the root.

n	a(n)
0	0
1	0
2	0
3	1
4	1
5	3
6	5
7	12
8	23
9	52
10	109
11	244
12	532
13	1196
14	2671
15	6055
16	13726
17	31380
18	71901
19	165635
20	382610
21	887215
22	2062777
23	4810230
24	11243898
25	26346341
26	61863991
27	145560102
28	343121676
29	810246372
30	1916417479
31	4539722153
32	10769366928
33	25582243781
34	60847034869

[0, 0, 0, 1, 1, 3, 5, 12, 23, 52, 109, 244, 532, 1196, 2671, 6055, 13726, 31380, 71901, 165635, 382610, 887215, 2062777, 4810230, 11243898, 26346341, 61863991, 145560102, 343121676, 810246372, 1916417479, 4539722153, 10769366928, 25582243781, 60847034869]

cp's OEIS Frontend

A036657 Number of n-node rooted unlabeled trees with out-degree <=2 and exactly 2 edges at the root.

Table of values

List of values