A146380 - OEIS

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A146380 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	13
7	27
8	135
9	527
10	2581
11	17899
12	176183
13	1596080
14	23232289
15	321756402
16	6986541337
17	150961652645
18	4812704574943
19	154830665386988

[1,1,1,1,1,13,27,135,527,2581,17899,176183, 1596080,23232289,321756402,6986541337, 150961652645,4812704574943,154830665386988]