A081064 - cp's OEIS frontend

A081064 Irregular array, read by rows: T(n,k) is the number of labeled acyclic digraphs with n nodes and k arcs (n >= 0, 0 <= k <= n*(n-1)/2).

n	a(n)
0	1
1	1
2	1
3	2
4	1
5	6
6	12
7	6
8	1
9	12
10	60
11	152
12	186
13	108
14	24
15	1
16	20
17	180
18	940
19	3050
20	6180
21	7960
22	6540
23	3330
24	960
25	120
26	1
27	30
28	420
29	3600
30	20790
31	83952
32	240480
33	496680
34	750810
35	838130
36	691020
37	416160
38	178230
39	51480
40	9000
41	720
42	1
43	42
44	840
45	10570
46	93030
47	601944

[1, 1, 1, 2, 1, 6, 12, 6, 1, 12, 60, 152, 186, 108, 24, 1, 20, 180, 940, 3050, 6180, 7960, 6540, 3330, 960, 120, 1, 30, 420, 3600, 20790, 83952, 240480, 496680, 750810, 838130, 691020, 416160, 178230, 51480, 9000, 720, 1, 42, 840, 10570, 93030, 601944]

cp's OEIS Frontend

A081064 Irregular array, read by rows: T(n,k) is the number of labeled acyclic digraphs with n nodes and k arcs (n >= 0, 0 <= k <= n*(n-1)/2).

Table of values

List of values