A323298 - cp's OEIS frontend

A323298 Number of 3-uniform hypergraphs spanning n labeled vertices where every two edges have exactly one vertex in common.

n	a(n)
0	1
1	0
2	0
3	1
4	0
5	15
6	150
7	1815
8	0
9	945
10	0
11	10395
12	0
13	135135
14	0
15	2027025
16	0
17	34459425
18	0
19	654729075
20	0
21	13749310575
22	0
23	316234143225
24	0
25	7905853580625
26	0
27	213458046676875
28	0
29	6190283353629375
30	0
31	191898783962510625
32	0
33	6332659870762850625
34	0
35	221643095476699771875

[1, 0, 0, 1, 0, 15, 150, 1815, 0, 945, 0, 10395, 0, 135135, 0, 2027025, 0, 34459425, 0, 654729075, 0, 13749310575, 0, 316234143225, 0, 7905853580625, 0, 213458046676875, 0, 6190283353629375, 0, 191898783962510625, 0, 6332659870762850625, 0, 221643095476699771875]

cp's OEIS Frontend

A323298 Number of 3-uniform hypergraphs spanning n labeled vertices where every two edges have exactly one vertex in common.

Table of values

List of values