A185421 - cp's OEIS frontend

A185421 Ordered forests of k increasing unordered trees on the vertex set {1,2,...,n} in which all outdegrees are <= 2.

n	a(n)
1	1
2	1
3	2
4	2
5	6
6	6
7	5
8	22
9	36
10	24
11	16
12	90
13	210
14	240
15	120
16	61
17	422
18	1260
19	2040
20	1800
21	720
22	272
23	2226
24	8106
25	16800
26	21000
27	15120
28	5040
29	1385
30	13102
31	56196
32	141624
33	226800
34	231840
35	141120
36	40320
37	7936
38	85170
39	420330
40	1244880
41	2421720
42	3175200
43	2751840
44	1451520
45	362880

[1, 1, 2, 2, 6, 6, 5, 22, 36, 24, 16, 90, 210, 240, 120, 61, 422, 1260, 2040, 1800, 720, 272, 2226, 8106, 16800, 21000, 15120, 5040, 1385, 13102, 56196, 141624, 226800, 231840, 141120, 40320, 7936, 85170, 420330, 1244880, 2421720, 3175200, 2751840, 1451520, 362880]

cp's OEIS Frontend

A185421 Ordered forests of k increasing unordered trees on the vertex set {1,2,...,n} in which all outdegrees are <= 2.

Table of values

List of values