A225465 - cp's OEIS frontend

A225465 Triangular array read by rows: T(n, k) is the number of rooted forests on {1, 2, ..., n} in which one tree has been specially designated that contain exactly k trees; n >= 1, 1 <= k <= n.

n	a(n)
1	1
2	2
3	2
4	9
5	12
6	3
7	64
8	96
9	36
10	4
11	625
12	1000
13	450
14	80
15	5
16	7776
17	12960
18	6480
19	1440
20	150
21	6
22	117649
23	201684
24	108045
25	27440
26	3675
27	252
28	7
29	2097152
30	3670016
31	2064384
32	573440
33	89600
34	8064
35	392
36	8
37	43046721
38	76527504
39	44641044
40	13226976
41	2296350
42	244944
43	15876
44	576
45	9

[1, 2, 2, 9, 12, 3, 64, 96, 36, 4, 625, 1000, 450, 80, 5, 7776, 12960, 6480, 1440, 150, 6, 117649, 201684, 108045, 27440, 3675, 252, 7, 2097152, 3670016, 2064384, 573440, 89600, 8064, 392, 8, 43046721, 76527504, 44641044, 13226976, 2296350, 244944, 15876, 576, 9]

cp's OEIS Frontend

A225465 Triangular array read by rows: T(n, k) is the number of rooted forests on {1, 2, ..., n} in which one tree has been specially designated that contain exactly k trees; n >= 1, 1 <= k <= n.

Table of values

List of values