A123554 - cp's OEIS frontend

A123554 Triangle read by rows: T(n,k) = number of labeled loopless digraphs with n nodes and k arcs (n >= 1, 0 <= k <= n*(n-1)).

n	a(n)
1	1
2	1
3	2
4	1
5	1
6	6
7	15
8	20
9	15
10	6
11	1
12	1
13	12
14	66
15	220
16	495
17	792
18	924
19	792
20	495
21	220
22	66
23	12
24	1
25	1
26	20
27	190
28	1140
29	4845
30	15504
31	38760
32	77520
33	125970
34	167960
35	184756
36	167960
37	125970
38	77520
39	38760
40	15504
41	4845
42	1140
43	190
44	20
45	1
46	1
47	30
48	435
49	4060
50	27405
51	142506
52	593775

[1, 1, 2, 1, 1, 6, 15, 20, 15, 6, 1, 1, 12, 66, 220, 495, 792, 924, 792, 495, 220, 66, 12, 1, 1, 20, 190, 1140, 4845, 15504, 38760, 77520, 125970, 167960, 184756, 167960, 125970, 77520, 38760, 15504, 4845, 1140, 190, 20, 1, 1, 30, 435, 4060, 27405, 142506, 593775]

cp's OEIS Frontend

A123554 Triangle read by rows: T(n,k) = number of labeled loopless digraphs with n nodes and k arcs (n >= 1, 0 <= k <= n*(n-1)).

Table of values

List of values