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A086424
as a simple table
n
a(n)
1
1
2
2
3
4
4
11
5
25
6
64
7
171
8
569
9
3406
10
27697
11
243374
12
1759619
13
28381401
14
222323189
15
3416307938
16
26838745347
[1,2,4,11,25,64,171,569,3406,27697,243374,1759619, 28381401,222323189,3416307938,26838745347]