A057272 - cp's OEIS frontend

A057272 Triangle T(n,k) of number of digraphs with a quasi-source on n labeled nodes and with k arcs, k=0,1,..,n*(n-1).

n	a(n)
1	1
2	0
3	2
4	1
5	0
6	0
7	12
8	20
9	15
10	6
11	1
12	0
13	0
14	0
15	104
16	426
17	768
18	920
19	792
20	495
21	220
22	66
23	12
24	1
25	0
26	0
27	0
28	0
29	1160
30	9184
31	32420
32	73000
33	123425
34	166860
35	184426
36	167900
37	125965
38	77520
39	38760
40	15504
41	4845
42	1140
43	190
44	20
45	1

[1, 0, 2, 1, 0, 0, 12, 20, 15, 6, 1, 0, 0, 0, 104, 426, 768, 920, 792, 495, 220, 66, 12, 1, 0, 0, 0, 0, 1160, 9184, 32420, 73000, 123425, 166860, 184426, 167900, 125965, 77520, 38760, 15504, 4845, 1140, 190, 20, 1]

cp's OEIS Frontend

A057272 Triangle T(n,k) of number of digraphs with a quasi-source on n labeled nodes and with k arcs, k=0,1,..,n*(n-1).

Table of values

List of values