A143841 - cp's OEIS frontend

A143841 Table read by antidiagonals: T(n,k) is the number of strongly connected directed multigraphs with loops with n arcs and up to k vertices.

n	a(n)
0	1
1	1
2	0
3	1
4	1
5	0
6	1
7	1
8	1
9	0
10	1
11	1
12	2
13	1
14	0
15	1
16	1
17	2
18	3
19	1
20	0
21	1
22	1
23	2
24	4
25	7
26	1
27	0
28	1
29	1
30	2
31	4
32	11
33	11
34	1
35	0
36	1
37	1
38	2
39	4
40	12
41	30
42	20
43	1
44	0
45	1
46	1
47	2
48	4
49	12
50	36
51	93
52	29
53	1
54	0
55	1
56	1
57	2
58	4
59	12
60	37
61	152
62	237
63	45
64	1
65	0
66	1
67	1
68	2
69	4
70	12
71	37
72	161
73	587
74	579
75	61
76	1
77	0

[1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 2, 1, 0, 1, 1, 2, 3, 1, 0, 1, 1, 2, 4, 7, 1, 0, 1, 1, 2, 4, 11, 11, 1, 0, 1, 1, 2, 4, 12, 30, 20, 1, 0, 1, 1, 2, 4, 12, 36, 93, 29, 1, 0, 1, 1, 2, 4, 12, 37, 152, 237, 45, 1, 0, 1, 1, 2, 4, 12, 37, 161, 587, 579, 61, 1, 0]

cp's OEIS Frontend

A143841 Table read by antidiagonals: T(n,k) is the number of strongly connected directed multigraphs with loops with n arcs and up to k vertices.

Table of values

List of values

n	a(n)
0	1
1	1
2	0
3	1
4	1
5	0
6	1
7	1
8	1
9	0
10	1
11	1
12	2
13	1
14	0
15	1
16	1
17	2
18	3
19	1
20	0
21	1
22	1
23	2
24	4
25	7
26	1
27	0
28	1
29	1
30	2
31	4
32	11
33	11
34	1
35	0
36	1
37	1
38	2
39	4
40	12
41	30
42	20
43	1
44	0
45	1
46	1
47	2
48	4
49	12
50	36
51	93
52	29
53	1
54	0
55	1
56	1
57	2
58	4
59	12
60	37
61	152
62	237
63	45
64	1
65	0
66	1
67	1
68	2
69	4
70	12
71	37
72	161
73	587
74	579
75	61
76	1
77	0

n	a(n)
0	1
1	1
2	0
3	1
4	1
5	0
6	1
7	1
8	1
9	0
10	1
11	1
12	2
13	1
14	0
15	1
16	1
17	2
18	3
19	1
20	0
21	1
22	1
23	2
24	4
25	7
26	1
27	0
28	1
29	1
30	2
31	4
32	11
33	11
34	1
35	0
36	1
37	1
38	2
39	4
40	12
41	30
42	20
43	1
44	0
45	1
46	1
47	2
48	4
49	12
50	36
51	93
52	29
53	1
54	0
55	1
56	1
57	2
58	4
59	12
60	37
61	152
62	237
63	45
64	1
65	0
66	1
67	1
68	2
69	4
70	12
71	37
72	161
73	587
74	579
75	61
76	1
77	0

n	a(n)
0	1
1	1
2	0
3	1
4	1
5	0
6	1
7	1
8	1
9	0
10	1
11	1
12	2
13	1
14	0
15	1
16	1
17	2
18	3
19	1
20	0
21	1
22	1
23	2
24	4
25	7
26	1
27	0
28	1
29	1
30	2
31	4
32	11
33	11
34	1
35	0
36	1
37	1
38	2
39	4
40	12
41	30
42	20
43	1
44	0
45	1
46	1
47	2
48	4
49	12
50	36
51	93
52	29
53	1
54	0
55	1
56	1
57	2
58	4
59	12
60	37
61	152
62	237
63	45
64	1
65	0
66	1
67	1
68	2
69	4
70	12
71	37
72	161
73	587
74	579
75	61
76	1
77	0