A217654 - cp's OEIS frontend

A217654 Triangular array read by rows. T(n,k) is the number of unlabeled directed graphs of n nodes that have exactly k isolated nodes.

n	a(n)
0	1
1	0
2	1
3	2
4	0
5	1
6	13
7	2
8	0
9	1
10	202
11	13
12	2
13	0
14	1
15	9390
16	202
17	13
18	2
19	0
20	1
21	1531336
22	9390
23	202
24	13
25	2
26	0
27	1
28	880492496
29	1531336
30	9390
31	202
32	13
33	2
34	0
35	1
36	1792477159408
37	880492496
38	1531336
39	9390
40	202
41	13
42	2
43	0
44	1
45	13026163465206704
46	1792477159408
47	880492496
48	1531336
49	9390
50	202
51	13
52	2
53	0
54	1

[1, 0, 1, 2, 0, 1, 13, 2, 0, 1, 202, 13, 2, 0, 1, 9390, 202, 13, 2, 0, 1, 1531336, 9390, 202, 13, 2, 0, 1, 880492496, 1531336, 9390, 202, 13, 2, 0, 1, 1792477159408, 880492496, 1531336, 9390, 202, 13, 2, 0, 1, 13026163465206704, 1792477159408, 880492496, 1531336, 9390, 202, 13, 2, 0, 1]

cp's OEIS Frontend

A217654 Triangular array read by rows. T(n,k) is the number of unlabeled directed graphs of n nodes that have exactly k isolated nodes.

Table of values

List of values