A123301 - cp's OEIS frontend

A123301 Triangle read by rows: T(n,k) is the number of specially labeled bicolored nonseparable graphs with k points in one color class and n-k points in the other class. "Special" means there are separate labels 1,2,...,k and 1,2,...,n-k for the two color classes (n >= 2, k = 1,...,n-1).

n	a(n)
2	1
3	0
4	0
5	0
6	1
7	0
8	0
9	1
10	1
11	0
12	0
13	1
14	34
15	1
16	0
17	0
18	1
19	199
20	199
21	1
22	0
23	0
24	1
25	916
26	7037
27	916
28	1
29	0
30	0
31	1
32	3889
33	117071
34	117071
35	3889
36	1
37	0
38	0
39	1
40	15982
41	1535601
42	6317926
43	1535601
44	15982
45	1
46	0
47	0
48	1
49	64747
50	18271947
51	228842801
52	228842801
53	18271947

[1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 34, 1, 0, 0, 1, 199, 199, 1, 0, 0, 1, 916, 7037, 916, 1, 0, 0, 1, 3889, 117071, 117071, 3889, 1, 0, 0, 1, 15982, 1535601, 6317926, 1535601, 15982, 1, 0, 0, 1, 64747, 18271947, 228842801, 228842801, 18271947]

cp's OEIS Frontend

A123301 Triangle read by rows: T(n,k) is the number of specially labeled bicolored nonseparable graphs with k points in one color class and n-k points in the other class. "Special" means there are separate labels 1,2,...,k and 1,2,...,n-k for the two color classes (n >= 2, k = 1,...,n-1).

Table of values

List of values