A143397 - cp's OEIS frontend

A143397 Triangle T(n,k)=number of forests of labeled rooted trees of height at most 1, with n labels and k nodes, where any root may contain >= 1 labels, n >= 0, 0<=k<=n.

n	a(n)
0	1
1	0
2	1
3	0
4	1
5	3
6	0
7	1
8	6
9	10
10	0
11	1
12	11
13	36
14	41
15	0
16	1
17	20
18	105
19	230
20	196
21	0
22	1
23	37
24	285
25	955
26	1560
27	1057
28	0
29	1
30	70
31	756
32	3535
33	8680
34	11277
35	6322
36	0
37	1
38	135
39	2002
40	12453
41	41720
42	80682
43	86800
44	41393
45	0
46	1
47	264
48	5347
49	43008
50	186669
51	485982
52	773724
53	708948
54	293608

[1, 0, 1, 0, 1, 3, 0, 1, 6, 10, 0, 1, 11, 36, 41, 0, 1, 20, 105, 230, 196, 0, 1, 37, 285, 955, 1560, 1057, 0, 1, 70, 756, 3535, 8680, 11277, 6322, 0, 1, 135, 2002, 12453, 41720, 80682, 86800, 41393, 0, 1, 264, 5347, 43008, 186669, 485982, 773724, 708948, 293608]

cp's OEIS Frontend

A143397 Triangle T(n,k)=number of forests of labeled rooted trees of height at most 1, with n labels and k nodes, where any root may contain >= 1 labels, n >= 0, 0<=k<=n.

Table of values

List of values