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A167995
as a simple table
n
a(n)
1
1
2
1
3
3
4
10
5
44
6
238
7
1506
8
10960
9
90449
10
834166
11
8496388
12
94738095
13
1148207875
14
15031585103
15
211388932628
[1,1,3,10,44,238,1506,10960,90449,834166,8496388, 94738095,1148207875,15031585103,211388932628]