A174603 - OEIS

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A174603 as a simple table

n	a(n)
0	1
1	3
2	9
3	189
4	1053
5	5103
6	88209
7	645165
8	4048137
9	65209779
10	563386509
11	4202694477
12	65731280085
13	638202713931
14	5411035008297
15	83729760898797
16	888040122326001
17	8324727674858595

[1,3,9,189,1053,5103,88209,645165,4048137, 65209779,563386509,4202694477,65731280085, 638202713931,5411035008297,83729760898797, 888040122326001,8324727674858595]