A122078 - cp's OEIS frontend

A122078 Triangle read by rows: T(n,k) is the number of unlabeled acyclic digraphs with n >= 0 nodes and n-k outnodes (0 <= k <= n).

n	a(n)
0	1
1	1
2	0
3	1
4	1
5	0
6	1
7	2
8	3
9	0
10	1
11	3
12	11
13	16
14	0
15	1
16	4
17	25
18	108
19	164
20	0
21	1
22	5
23	47
24	422
25	2168
26	3341
27	0
28	1
29	6
30	78
31	1251
32	15484
33	88747
34	138101
35	0
36	1
37	7
38	120
39	3124
40	79836
41	1215783
42	7409117
43	11578037
44	0
45	1
46	8
47	174
48	6925
49	333004
50	11620961
51	199203464
52	1252610909
53	1961162564
54	0

[1, 1, 0, 1, 1, 0, 1, 2, 3, 0, 1, 3, 11, 16, 0, 1, 4, 25, 108, 164, 0, 1, 5, 47, 422, 2168, 3341, 0, 1, 6, 78, 1251, 15484, 88747, 138101, 0, 1, 7, 120, 3124, 79836, 1215783, 7409117, 11578037, 0, 1, 8, 174, 6925, 333004, 11620961, 199203464, 1252610909, 1961162564, 0]

cp's OEIS Frontend

A122078 Triangle read by rows: T(n,k) is the number of unlabeled acyclic digraphs with n >= 0 nodes and n-k outnodes (0 <= k <= n).

Table of values

List of values