A105618 - OEIS

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A105618 as a simple table

n	a(n)
0	1
1	3
2	15
3	107
4	991
5	11203
6	148879
7	2270027
8	39041151
9	747704963
10	15784630159
11	364256650027
12	9124264794271
13	246600188525123
14	7153677209063439
15	221729176945261067
16	7313478624348963391
17	255786689421734222083

[1,3,15,107,991,11203,148879,2270027,39041151, 747704963,15784630159,364256650027,9124264794271, 246600188525123,7153677209063439, 221729176945261067,7313478624348963391, 255786689421734222083]