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A146460
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
5
6
25
7
87
8
503
9
2831
10
25037
11
243793
12
3762955
13
62868913
14
1572482009
15
42577954723
16
1734990453303
[1,1,1,1,5,25,87,503,2831,25037,243793,3762955, 62868913,1572482009,42577954723,1734990453303]