A309936 - cp's OEIS frontend

A309936 Irregular triangle read by rows: T(n,k) is the number of unlabeled loopless multigraphs with n edges covering k vertices, n >= 1, 1 <= k <= 2*n.

n	a(n)
1	0
2	1
3	0
4	1
5	1
6	1
7	0
8	1
9	2
10	3
11	1
12	1
13	0
14	1
15	3
16	7
17	6
18	4
19	1
20	1
21	0
22	1
23	4
24	13
25	17
26	17
27	8
28	4
29	1
30	1
31	0
32	1
33	6
34	25
35	44
36	56
37	41
38	24
39	9
40	4
41	1
42	1
43	0
44	1
45	7
46	40
47	101
48	164
49	158
50	117
51	57
52	26
53	9
54	4
55	1
56	1
57	0
58	1
59	9
60	65
61	216
62	450
63	562
64	503
65	315
66	162
67	64
68	27
69	9
70	4
71	1
72	1

[0, 1, 0, 1, 1, 1, 0, 1, 2, 3, 1, 1, 0, 1, 3, 7, 6, 4, 1, 1, 0, 1, 4, 13, 17, 17, 8, 4, 1, 1, 0, 1, 6, 25, 44, 56, 41, 24, 9, 4, 1, 1, 0, 1, 7, 40, 101, 164, 158, 117, 57, 26, 9, 4, 1, 1, 0, 1, 9, 65, 216, 450, 562, 503, 315, 162, 64, 27, 9, 4, 1, 1]

cp's OEIS Frontend

A309936 Irregular triangle read by rows: T(n,k) is the number of unlabeled loopless multigraphs with n edges covering k vertices, n >= 1, 1 <= k <= 2*n.

Table of values

List of values

n	a(n)
1	0
2	1
3	0
4	1
5	1
6	1
7	0
8	1
9	2
10	3
11	1
12	1
13	0
14	1
15	3
16	7
17	6
18	4
19	1
20	1
21	0
22	1
23	4
24	13
25	17
26	17
27	8
28	4
29	1
30	1
31	0
32	1
33	6
34	25
35	44
36	56
37	41
38	24
39	9
40	4
41	1
42	1
43	0
44	1
45	7
46	40
47	101
48	164
49	158
50	117
51	57
52	26
53	9
54	4
55	1
56	1
57	0
58	1
59	9
60	65
61	216
62	450
63	562
64	503
65	315
66	162
67	64
68	27
69	9
70	4
71	1
72	1

n	a(n)
1	0
2	1
3	0
4	1
5	1
6	1
7	0
8	1
9	2
10	3
11	1
12	1
13	0
14	1
15	3
16	7
17	6
18	4
19	1
20	1
21	0
22	1
23	4
24	13
25	17
26	17
27	8
28	4
29	1
30	1
31	0
32	1
33	6
34	25
35	44
36	56
37	41
38	24
39	9
40	4
41	1
42	1
43	0
44	1
45	7
46	40
47	101
48	164
49	158
50	117
51	57
52	26
53	9
54	4
55	1
56	1
57	0
58	1
59	9
60	65
61	216
62	450
63	562
64	503
65	315
66	162
67	64
68	27
69	9
70	4
71	1
72	1

n	a(n)
1	0
2	1
3	0
4	1
5	1
6	1
7	0
8	1
9	2
10	3
11	1
12	1
13	0
14	1
15	3
16	7
17	6
18	4
19	1
20	1
21	0
22	1
23	4
24	13
25	17
26	17
27	8
28	4
29	1
30	1
31	0
32	1
33	6
34	25
35	44
36	56
37	41
38	24
39	9
40	4
41	1
42	1
43	0
44	1
45	7
46	40
47	101
48	164
49	158
50	117
51	57
52	26
53	9
54	4
55	1
56	1
57	0
58	1
59	9
60	65
61	216
62	450
63	562
64	503
65	315
66	162
67	64
68	27
69	9
70	4
71	1
72	1