A336167 - cp's OEIS frontend

A336167 Irregular triangular array read by rows. T(n,k) is the number of forests on n unlabeled nodes with exactly k distinct isomorphism classes of trees.

n	a(n)
0	1
1	0
2	1
3	0
4	2
5	0
6	2
7	1
8	0
9	4
10	2
11	0
12	4
13	6
14	0
15	9
16	10
17	1
18	0
19	12
20	22
21	3
22	0
23	27
24	40
25	9
26	0
27	49
28	80
29	24
30	0
31	111
32	163
33	53
34	2
35	0
36	236
37	342
38	126
39	6
40	0
41	562
42	738
43	280
44	21
45	0
46	1302
47	1662
48	634
49	60
50	0
51	3172
52	3838
53	1423
54	165
55	1
56	0
57	7746
58	9041
59	3308
60	412
61	7
62	0
63	19347
64	21812
65	7676
66	1044
67	26

[1, 0, 1, 0, 2, 0, 2, 1, 0, 4, 2, 0, 4, 6, 0, 9, 10, 1, 0, 12, 22, 3, 0, 27, 40, 9, 0, 49, 80, 24, 0, 111, 163, 53, 2, 0, 236, 342, 126, 6, 0, 562, 738, 280, 21, 0, 1302, 1662, 634, 60, 0, 3172, 3838, 1423, 165, 1, 0, 7746, 9041, 3308, 412, 7, 0, 19347, 21812, 7676, 1044, 26]

cp's OEIS Frontend

A336167 Irregular triangular array read by rows. T(n,k) is the number of forests on n unlabeled nodes with exactly k distinct isomorphism classes of trees.

Table of values

List of values