A052225 - OEIS

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A052225 as a simple table

n	a(n)
1	5
2	27
3	141
4	837
5	5757
6	45357
7	403197
8	3991677
9	43545597
10	518918397
11	6706022397
12	93405311997
13	1394852659197
14	22230464255997
15	376610217983997
16	6758061133823997
17	128047474114559997
18	2554547108585471997

[5,27,141,837,5757,45357,403197,3991677,43545597, 518918397,6706022397,93405311997,1394852659197, 22230464255997,376610217983997,6758061133823997, 128047474114559997,2554547108585471997]