A215977 - cp's OEIS frontend

A215977 Number T(n,k) of simple unlabeled graphs on n nodes with exactly k connected components that are trees or cycles; triangle T(n,k), n >= 0, 0 <= k <= n, read by rows.

n	a(n)
0	1
1	0
2	1
3	0
4	1
5	1
6	0
7	2
8	1
9	1
10	0
11	3
12	3
13	1
14	1
15	0
16	4
17	5
18	3
19	1
20	1
21	0
22	7
23	10
24	6
25	3
26	1
27	1
28	0
29	12
30	17
31	12
32	6
33	3
34	1
35	1
36	0
37	24
38	33
39	23
40	13
41	6
42	3
43	1
44	1
45	0
46	48
47	62
48	47
49	25
50	13
51	6
52	3
53	1
54	1
55	0
56	107
57	127
58	92
59	53
60	26
61	13
62	6
63	3
64	1
65	1
66	0
67	236
68	267
69	189
70	106
71	55
72	26
73	13
74	6
75	3
76	1
77	1

[1, 0, 1, 0, 1, 1, 0, 2, 1, 1, 0, 3, 3, 1, 1, 0, 4, 5, 3, 1, 1, 0, 7, 10, 6, 3, 1, 1, 0, 12, 17, 12, 6, 3, 1, 1, 0, 24, 33, 23, 13, 6, 3, 1, 1, 0, 48, 62, 47, 25, 13, 6, 3, 1, 1, 0, 107, 127, 92, 53, 26, 13, 6, 3, 1, 1, 0, 236, 267, 189, 106, 55, 26, 13, 6, 3, 1, 1]

cp's OEIS Frontend

A215977 Number T(n,k) of simple unlabeled graphs on n nodes with exactly k connected components that are trees or cycles; triangle T(n,k), n >= 0, 0 <= k <= n, read by rows.

Table of values

List of values

n	a(n)
0	1
1	0
2	1
3	0
4	1
5	1
6	0
7	2
8	1
9	1
10	0
11	3
12	3
13	1
14	1
15	0
16	4
17	5
18	3
19	1
20	1
21	0
22	7
23	10
24	6
25	3
26	1
27	1
28	0
29	12
30	17
31	12
32	6
33	3
34	1
35	1
36	0
37	24
38	33
39	23
40	13
41	6
42	3
43	1
44	1
45	0
46	48
47	62
48	47
49	25
50	13
51	6
52	3
53	1
54	1
55	0
56	107
57	127
58	92
59	53
60	26
61	13
62	6
63	3
64	1
65	1
66	0
67	236
68	267
69	189
70	106
71	55
72	26
73	13
74	6
75	3
76	1
77	1

n	a(n)
0	1
1	0
2	1
3	0
4	1
5	1
6	0
7	2
8	1
9	1
10	0
11	3
12	3
13	1
14	1
15	0
16	4
17	5
18	3
19	1
20	1
21	0
22	7
23	10
24	6
25	3
26	1
27	1
28	0
29	12
30	17
31	12
32	6
33	3
34	1
35	1
36	0
37	24
38	33
39	23
40	13
41	6
42	3
43	1
44	1
45	0
46	48
47	62
48	47
49	25
50	13
51	6
52	3
53	1
54	1
55	0
56	107
57	127
58	92
59	53
60	26
61	13
62	6
63	3
64	1
65	1
66	0
67	236
68	267
69	189
70	106
71	55
72	26
73	13
74	6
75	3
76	1
77	1

n	a(n)
0	1
1	0
2	1
3	0
4	1
5	1
6	0
7	2
8	1
9	1
10	0
11	3
12	3
13	1
14	1
15	0
16	4
17	5
18	3
19	1
20	1
21	0
22	7
23	10
24	6
25	3
26	1
27	1
28	0
29	12
30	17
31	12
32	6
33	3
34	1
35	1
36	0
37	24
38	33
39	23
40	13
41	6
42	3
43	1
44	1
45	0
46	48
47	62
48	47
49	25
50	13
51	6
52	3
53	1
54	1
55	0
56	107
57	127
58	92
59	53
60	26
61	13
62	6
63	3
64	1
65	1
66	0
67	236
68	267
69	189
70	106
71	55
72	26
73	13
74	6
75	3
76	1
77	1