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A147035
as a simple table
n
a(n)
1
1
2
1
3
1
4
5
5
17
6
39
7
181
8
1975
9
28231
10
443863
11
9105701
12
306959063
13
15386456557
14
1024328375043
15
94252026378527
[1,1,1,5,17,39,181,1975,28231,443863,9105701, 306959063,15386456557,1024328375043, 94252026378527]