A123474 - cp's OEIS frontend

A123474 Triangle read by rows: T(n,k) = number of labeled bicolored nonseparable graphs with k points in one color class and n-k points in the other class. The classes are interchangeable if k = n-k. Here n >= 2, k=1..n-1.

n	a(n)
2	1
3	0
4	0
5	0
6	3
7	0
8	0
9	10
10	10
11	0
12	0
13	15
14	340
15	15
16	0
17	0
18	21
19	6965
20	6965
21	21
22	0
23	0
24	28
25	51296
26	246295
27	51296
28	28
29	0
30	0
31	36
32	326676
33	14750946
34	14750946
35	326676
36	36
37	0
38	0
39	45
40	1917840
41	322476210
42	796058676
43	322476210
44	1917840
45	45
46	0
47	0
48	55
49	10683255

[1, 0, 0, 0, 3, 0, 0, 10, 10, 0, 0, 15, 340, 15, 0, 0, 21, 6965, 6965, 21, 0, 0, 28, 51296, 246295, 51296, 28, 0, 0, 36, 326676, 14750946, 14750946, 326676, 36, 0, 0, 45, 1917840, 322476210, 796058676, 322476210, 1917840, 45, 0, 0, 55, 10683255]

cp's OEIS Frontend

A123474 Triangle read by rows: T(n,k) = number of labeled bicolored nonseparable graphs with k points in one color class and n-k points in the other class. The classes are interchangeable if k = n-k. Here n >= 2, k=1..n-1.

Table of values

List of values