A383448 - cp's OEIS frontend

A383448 Irregular triangle read by rows: T(n,k) (n>=1, k>=0) is the number of trees with n nodes in which there are k edges whose end-vertices have the same degree.

n	a(n)
1	1
2	0
3	1
4	1
5	1
6	1
7	2
8	0
9	1
10	3
11	2
12	0
13	1
14	6
15	3
16	1
17	0
18	1
19	9
20	7
21	5
22	1
23	0
24	1
25	19
26	12
27	10
28	4
29	1
30	0
31	1
32	33
33	33
34	18
35	15
36	5
37	1
38	0
39	1
40	67
41	66
42	54
43	26
44	15
45	5
46	1
47	0
48	1
49	130
50	154
51	128
52	77
53	36
54	18
55	6
56	1
57	0
58	1
59	270
60	344
61	309
62	199
63	110
64	40
65	21
66	6
67	1
68	0
69	1
70	547
71	806
72	752
73	530
74	294
75	147
76	50
77	24
78	7
79	1
80	0
81	1

[1, 0, 1, 1, 1, 1, 2, 0, 1, 3, 2, 0, 1, 6, 3, 1, 0, 1, 9, 7, 5, 1, 0, 1, 19, 12, 10, 4, 1, 0, 1, 33, 33, 18, 15, 5, 1, 0, 1, 67, 66, 54, 26, 15, 5, 1, 0, 1, 130, 154, 128, 77, 36, 18, 6, 1, 0, 1, 270, 344, 309, 199, 110, 40, 21, 6, 1, 0, 1, 547, 806, 752, 530, 294, 147, 50, 24, 7, 1, 0, 1]

cp's OEIS Frontend

A383448 Irregular triangle read by rows: T(n,k) (n>=1, k>=0) is the number of trees with n nodes in which there are k edges whose end-vertices have the same degree.

Table of values

List of values

n	a(n)
1	1
2	0
3	1
4	1
5	1
6	1
7	2
8	0
9	1
10	3
11	2
12	0
13	1
14	6
15	3
16	1
17	0
18	1
19	9
20	7
21	5
22	1
23	0
24	1
25	19
26	12
27	10
28	4
29	1
30	0
31	1
32	33
33	33
34	18
35	15
36	5
37	1
38	0
39	1
40	67
41	66
42	54
43	26
44	15
45	5
46	1
47	0
48	1
49	130
50	154
51	128
52	77
53	36
54	18
55	6
56	1
57	0
58	1
59	270
60	344
61	309
62	199
63	110
64	40
65	21
66	6
67	1
68	0
69	1
70	547
71	806
72	752
73	530
74	294
75	147
76	50
77	24
78	7
79	1
80	0
81	1

n	a(n)
1	1
2	0
3	1
4	1
5	1
6	1
7	2
8	0
9	1
10	3
11	2
12	0
13	1
14	6
15	3
16	1
17	0
18	1
19	9
20	7
21	5
22	1
23	0
24	1
25	19
26	12
27	10
28	4
29	1
30	0
31	1
32	33
33	33
34	18
35	15
36	5
37	1
38	0
39	1
40	67
41	66
42	54
43	26
44	15
45	5
46	1
47	0
48	1
49	130
50	154
51	128
52	77
53	36
54	18
55	6
56	1
57	0
58	1
59	270
60	344
61	309
62	199
63	110
64	40
65	21
66	6
67	1
68	0
69	1
70	547
71	806
72	752
73	530
74	294
75	147
76	50
77	24
78	7
79	1
80	0
81	1

n	a(n)
1	1
2	0
3	1
4	1
5	1
6	1
7	2
8	0
9	1
10	3
11	2
12	0
13	1
14	6
15	3
16	1
17	0
18	1
19	9
20	7
21	5
22	1
23	0
24	1
25	19
26	12
27	10
28	4
29	1
30	0
31	1
32	33
33	33
34	18
35	15
36	5
37	1
38	0
39	1
40	67
41	66
42	54
43	26
44	15
45	5
46	1
47	0
48	1
49	130
50	154
51	128
52	77
53	36
54	18
55	6
56	1
57	0
58	1
59	270
60	344
61	309
62	199
63	110
64	40
65	21
66	6
67	1
68	0
69	1
70	547
71	806
72	752
73	530
74	294
75	147
76	50
77	24
78	7
79	1
80	0
81	1