A215861 - cp's OEIS frontend

A215861 Number T(n,k) of simple labeled graphs on n nodes with exactly k connected components that are trees or cycles; triangle T(n,k), n>=0, 0<=k<=n, read by rows.

n	a(n)
0	1
1	0
2	1
3	0
4	1
5	1
6	0
7	4
8	3
9	1
10	0
11	19
12	19
13	6
14	1
15	0
16	137
17	135
18	55
19	10
20	1
21	0
22	1356
23	1267
24	540
25	125
26	15
27	1
28	0
29	17167
30	15029
31	6412
32	1610
33	245
34	21
35	1
36	0
37	264664
38	218627
39	90734
40	23597
41	3990
42	434
43	28
44	1
45	0
46	4803129
47	3783582
48	1515097
49	394506
50	70707
51	8694
52	714
53	36
54	1

[1, 0, 1, 0, 1, 1, 0, 4, 3, 1, 0, 19, 19, 6, 1, 0, 137, 135, 55, 10, 1, 0, 1356, 1267, 540, 125, 15, 1, 0, 17167, 15029, 6412, 1610, 245, 21, 1, 0, 264664, 218627, 90734, 23597, 3990, 434, 28, 1, 0, 4803129, 3783582, 1515097, 394506, 70707, 8694, 714, 36, 1]

cp's OEIS Frontend

A215861 Number T(n,k) of simple labeled graphs on n nodes with exactly k connected components that are trees or cycles; triangle T(n,k), n>=0, 0<=k<=n, read by rows.

Table of values

List of values