A228601 - cp's OEIS frontend

A228601 Triangle read by rows: T(n,k) is the number of trees with n vertices and having k distinct rootings (1 <= k <= n).

n	a(n)
1	1
2	1
3	0
4	0
5	1
6	0
7	0
8	2
9	0
10	0
11	0
12	1
13	1
14	1
15	0
16	0
17	2
18	1
19	2
20	1
21	0
22	0
23	1
24	2
25	4
26	1
27	2
28	1
29	0
30	2
31	1
32	7
33	4
34	4
35	4
36	1
37	0
38	1
39	2
40	7
41	7
42	9
43	10
44	8
45	3
46	0
47	2
48	3
49	12
50	10
51	17
52	19
53	20
54	17
55	6
56	0
57	1
58	2
59	12
60	14
61	28
62	37
63	45
64	46
65	35
66	15
67	0
68	2
69	1
70	18
71	21
72	46
73	60
74	87
75	106
76	103
77	78
78	29

[1, 1, 0, 0, 1, 0, 0, 2, 0, 0, 0, 1, 1, 1, 0, 0, 2, 1, 2, 1, 0, 0, 1, 2, 4, 1, 2, 1, 0, 2, 1, 7, 4, 4, 4, 1, 0, 1, 2, 7, 7, 9, 10, 8, 3, 0, 2, 3, 12, 10, 17, 19, 20, 17, 6, 0, 1, 2, 12, 14, 28, 37, 45, 46, 35, 15, 0, 2, 1, 18, 21, 46, 60, 87, 106, 103, 78, 29]

cp's OEIS Frontend

A228601 Triangle read by rows: T(n,k) is the number of trees with n vertices and having k distinct rootings (1 <= k <= n).

Table of values

List of values

n	a(n)
1	1
2	1
3	0
4	0
5	1
6	0
7	0
8	2
9	0
10	0
11	0
12	1
13	1
14	1
15	0
16	0
17	2
18	1
19	2
20	1
21	0
22	0
23	1
24	2
25	4
26	1
27	2
28	1
29	0
30	2
31	1
32	7
33	4
34	4
35	4
36	1
37	0
38	1
39	2
40	7
41	7
42	9
43	10
44	8
45	3
46	0
47	2
48	3
49	12
50	10
51	17
52	19
53	20
54	17
55	6
56	0
57	1
58	2
59	12
60	14
61	28
62	37
63	45
64	46
65	35
66	15
67	0
68	2
69	1
70	18
71	21
72	46
73	60
74	87
75	106
76	103
77	78
78	29

n	a(n)
1	1
2	1
3	0
4	0
5	1
6	0
7	0
8	2
9	0
10	0
11	0
12	1
13	1
14	1
15	0
16	0
17	2
18	1
19	2
20	1
21	0
22	0
23	1
24	2
25	4
26	1
27	2
28	1
29	0
30	2
31	1
32	7
33	4
34	4
35	4
36	1
37	0
38	1
39	2
40	7
41	7
42	9
43	10
44	8
45	3
46	0
47	2
48	3
49	12
50	10
51	17
52	19
53	20
54	17
55	6
56	0
57	1
58	2
59	12
60	14
61	28
62	37
63	45
64	46
65	35
66	15
67	0
68	2
69	1
70	18
71	21
72	46
73	60
74	87
75	106
76	103
77	78
78	29

n	a(n)
1	1
2	1
3	0
4	0
5	1
6	0
7	0
8	2
9	0
10	0
11	0
12	1
13	1
14	1
15	0
16	0
17	2
18	1
19	2
20	1
21	0
22	0
23	1
24	2
25	4
26	1
27	2
28	1
29	0
30	2
31	1
32	7
33	4
34	4
35	4
36	1
37	0
38	1
39	2
40	7
41	7
42	9
43	10
44	8
45	3
46	0
47	2
48	3
49	12
50	10
51	17
52	19
53	20
54	17
55	6
56	0
57	1
58	2
59	12
60	14
61	28
62	37
63	45
64	46
65	35
66	15
67	0
68	2
69	1
70	18
71	21
72	46
73	60
74	87
75	106
76	103
77	78
78	29