A123260 - cp's OEIS frontend

A123260 Triangle read by rows: T(n,k) = number of specially labeled bicolored connected 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 >= 1, k = floor((n+1)/2), ..., n).

n	a(n)
1	1
2	1
3	0
4	1
5	0
6	5
7	1
8	0
9	19
10	1
11	0
12	205
13	65
14	1
15	0
16	1795
17	211
18	1
19	0
20	36317
21	14221
22	665
23	1
24	0
25	636331
26	106819
27	2059
28	1
29	0
30	23679901
31	10365005
32	778765
33	6305
34	1
35	0
36	805351531
37	162470155
38	5581315
39	19171
40	1
41	0
42	56294206205
43	26175881341
44	2495037197

[1, 1, 0, 1, 0, 5, 1, 0, 19, 1, 0, 205, 65, 1, 0, 1795, 211, 1, 0, 36317, 14221, 665, 1, 0, 636331, 106819, 2059, 1, 0, 23679901, 10365005, 778765, 6305, 1, 0, 805351531, 162470155, 5581315, 19171, 1, 0, 56294206205, 26175881341, 2495037197]

cp's OEIS Frontend

A123260 Triangle read by rows: T(n,k) = number of specially labeled bicolored connected 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 >= 1, k = floor((n+1)/2), ..., n).

Table of values

List of values