A228308 - cp's OEIS frontend

A228308 Triangle read by rows: T(n,k) (n>=2, 1<=k<=n-1) is the number of unordered pairs of vertices at distances k in the odd graph O_n.

n	a(n)
2	3
3	15
4	30
5	70
6	210
7	315
8	315
9	1260
10	2520
11	3780
12	1386
13	6930
14	17325
15	34650
16	46200
17	6006
18	36036
19	108108
20	270270
21	450450
22	600600
23	25740
24	180180
25	630630
26	1891890
27	3783780
28	6306300
29	7882875
30	109395
31	875160
32	3500640
33	12252240
34	28588560
35	57177120

[3, 15, 30, 70, 210, 315, 315, 1260, 2520, 3780, 1386, 6930, 17325, 34650, 46200, 6006, 36036, 108108, 270270, 450450, 600600, 25740, 180180, 630630, 1891890, 3783780, 6306300, 7882875, 109395, 875160, 3500640, 12252240, 28588560, 57177120]

cp's OEIS Frontend

A228308 Triangle read by rows: T(n,k) (n>=2, 1<=k<=n-1) is the number of unordered pairs of vertices at distances k in the odd graph O_n.

Table of values

List of values