A143395 - cp's OEIS frontend

A143395 Triangle read by rows: T(n,k) = number of forests of k labeled rooted trees of height at most 1, with n labels, where any root may contain >= 1 labels, n >= 0, 0 <= k <= n.

n	a(n)
0	1
1	0
2	1
3	0
4	3
5	1
6	0
7	7
8	9
9	1
10	0
11	15
12	55
13	18
14	1
15	0
16	31
17	285
18	205
19	30
20	1
21	0
22	63
23	1351
24	1890
25	545
26	45
27	1
28	0
29	127
30	6069
31	15421
32	7770
33	1190
34	63
35	1
36	0
37	255
38	26335
39	116298
40	95781
41	24150
42	2282
43	84
44	1
45	0
46	511
47	111645
48	830845
49	1071630
50	416451
51	62370
52	3990
53	108
54	1

[1, 0, 1, 0, 3, 1, 0, 7, 9, 1, 0, 15, 55, 18, 1, 0, 31, 285, 205, 30, 1, 0, 63, 1351, 1890, 545, 45, 1, 0, 127, 6069, 15421, 7770, 1190, 63, 1, 0, 255, 26335, 116298, 95781, 24150, 2282, 84, 1, 0, 511, 111645, 830845, 1071630, 416451, 62370, 3990, 108, 1]

cp's OEIS Frontend

A143395 Triangle read by rows: T(n,k) = number of forests of k labeled rooted trees of height at most 1, with n labels, where any root may contain >= 1 labels, n >= 0, 0 <= k <= n.

Table of values

List of values