A139621 - cp's OEIS frontend

A139621 Triangle read by rows: T(n,k) is the number of connected directed multigraphs with loops and no vertex of degree 0, with n arcs and k vertices.

n	a(n)
0	1
1	1
2	1
3	1
4	4
5	3
6	1
7	8
8	15
9	8
10	1
11	16
12	57
13	66
14	27
15	1
16	25
17	163
18	353
19	295
20	91
21	1
22	40
23	419
24	1504
25	2203
26	1407
27	350
28	1
29	56
30	932
31	5302
32	12382
33	13372
34	6790
35	1376
36	1
37	80
38	1940
39	16549
40	58237
41	96456
42	80736
43	33628
44	5743
45	1
46	105
47	3743
48	46566
49	237904
50	573963
51	717114
52	482730
53	168645
54	24635

[1, 1, 1, 1, 4, 3, 1, 8, 15, 8, 1, 16, 57, 66, 27, 1, 25, 163, 353, 295, 91, 1, 40, 419, 1504, 2203, 1407, 350, 1, 56, 932, 5302, 12382, 13372, 6790, 1376, 1, 80, 1940, 16549, 58237, 96456, 80736, 33628, 5743, 1, 105, 3743, 46566, 237904, 573963, 717114, 482730, 168645, 24635]

cp's OEIS Frontend

A139621 Triangle read by rows: T(n,k) is the number of connected directed multigraphs with loops and no vertex of degree 0, with n arcs and k vertices.

Table of values

List of values