A255636 - cp's OEIS frontend

A255636 Number A(n,k) of n-node rooted trees with a forbidden limb of length k; square array A(n,k), n>=1, k>=1, read by antidiagonals.

n	a(n)
1	1
2	1
3	0
4	1
5	1
6	0
7	1
8	1
9	1
10	0
11	1
12	1
13	2
14	2
15	0
16	1
17	1
18	2
19	3
20	4
21	0
22	1
23	1
24	2
25	4
26	7
27	8
28	0
29	1
30	1
31	2
32	4
33	8
34	15
35	17
36	0
37	1
38	1
39	2
40	4
41	9
42	18
43	35
44	36
45	0
46	1
47	1
48	2
49	4
50	9
51	19
52	43
53	81
54	79
55	0
56	1
57	1
58	2
59	4
60	9
61	20
62	46
63	102
64	195
65	175
66	0
67	1
68	1
69	2
70	4
71	9
72	20
73	47
74	110
75	251
76	473
77	395
78	0

[1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 2, 2, 0, 1, 1, 2, 3, 4, 0, 1, 1, 2, 4, 7, 8, 0, 1, 1, 2, 4, 8, 15, 17, 0, 1, 1, 2, 4, 9, 18, 35, 36, 0, 1, 1, 2, 4, 9, 19, 43, 81, 79, 0, 1, 1, 2, 4, 9, 20, 46, 102, 195, 175, 0, 1, 1, 2, 4, 9, 20, 47, 110, 251, 473, 395, 0]

cp's OEIS Frontend

A255636 Number A(n,k) of n-node rooted trees with a forbidden limb of length k; square array A(n,k), n>=1, k>=1, read by antidiagonals.

Table of values

List of values

n	a(n)
1	1
2	1
3	0
4	1
5	1
6	0
7	1
8	1
9	1
10	0
11	1
12	1
13	2
14	2
15	0
16	1
17	1
18	2
19	3
20	4
21	0
22	1
23	1
24	2
25	4
26	7
27	8
28	0
29	1
30	1
31	2
32	4
33	8
34	15
35	17
36	0
37	1
38	1
39	2
40	4
41	9
42	18
43	35
44	36
45	0
46	1
47	1
48	2
49	4
50	9
51	19
52	43
53	81
54	79
55	0
56	1
57	1
58	2
59	4
60	9
61	20
62	46
63	102
64	195
65	175
66	0
67	1
68	1
69	2
70	4
71	9
72	20
73	47
74	110
75	251
76	473
77	395
78	0

n	a(n)
1	1
2	1
3	0
4	1
5	1
6	0
7	1
8	1
9	1
10	0
11	1
12	1
13	2
14	2
15	0
16	1
17	1
18	2
19	3
20	4
21	0
22	1
23	1
24	2
25	4
26	7
27	8
28	0
29	1
30	1
31	2
32	4
33	8
34	15
35	17
36	0
37	1
38	1
39	2
40	4
41	9
42	18
43	35
44	36
45	0
46	1
47	1
48	2
49	4
50	9
51	19
52	43
53	81
54	79
55	0
56	1
57	1
58	2
59	4
60	9
61	20
62	46
63	102
64	195
65	175
66	0
67	1
68	1
69	2
70	4
71	9
72	20
73	47
74	110
75	251
76	473
77	395
78	0

n	a(n)
1	1
2	1
3	0
4	1
5	1
6	0
7	1
8	1
9	1
10	0
11	1
12	1
13	2
14	2
15	0
16	1
17	1
18	2
19	3
20	4
21	0
22	1
23	1
24	2
25	4
26	7
27	8
28	0
29	1
30	1
31	2
32	4
33	8
34	15
35	17
36	0
37	1
38	1
39	2
40	4
41	9
42	18
43	35
44	36
45	0
46	1
47	1
48	2
49	4
50	9
51	19
52	43
53	81
54	79
55	0
56	1
57	1
58	2
59	4
60	9
61	20
62	46
63	102
64	195
65	175
66	0
67	1
68	1
69	2
70	4
71	9
72	20
73	47
74	110
75	251
76	473
77	395
78	0