A174135 - cp's OEIS frontend

A174135 Irregular triangle read by rows: T(n,k), n >= 2, 1 <= k <= n/2, = number of rooted forests with n nodes and k trees, with at least two nodes in each tree.

n	a(n)
2	1
3	2
4	4
5	1
6	9
7	2
8	20
9	7
10	1
11	48
12	17
13	2
14	115
15	48
16	7
17	1
18	286
19	124
20	21
21	2
22	719
23	336
24	60
25	7
26	1
27	1842
28	888
29	171
30	21
31	2
32	4766
33	2393
34	488
35	65
36	7
37	1
38	12486
39	6419
40	1372
41	187
42	21
43	2
44	32973
45	17376
46	3862
47	554
48	65
49	7
50	1
51	87811
52	47097
53	10846
54	1600
55	193
56	21
57	2
58	235381
59	128365
60	30429
61	4644
62	574
63	65
64	7
65	1
66	634847
67	350837
68	85365
69	13362
70	1685
71	193
72	21
73	2

[1, 2, 4, 1, 9, 2, 20, 7, 1, 48, 17, 2, 115, 48, 7, 1, 286, 124, 21, 2, 719, 336, 60, 7, 1, 1842, 888, 171, 21, 2, 4766, 2393, 488, 65, 7, 1, 12486, 6419, 1372, 187, 21, 2, 32973, 17376, 3862, 554, 65, 7, 1, 87811, 47097, 10846, 1600, 193, 21, 2, 235381, 128365, 30429, 4644, 574, 65, 7, 1, 634847, 350837, 85365, 13362, 1685, 193, 21, 2]

cp's OEIS Frontend

A174135 Irregular triangle read by rows: T(n,k), n >= 2, 1 <= k <= n/2, = number of rooted forests with n nodes and k trees, with at least two nodes in each tree.

Table of values

List of values