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A007712
as a simple table
n
a(n)
2
1
3
2
4
4
5
14
6
72
7
316
8
1730
9
9728
10
64330
11
444890
12
3645441
13
28758111
14
265434293
15
2522822881
16
25717118338
[1,2,4,14,72,316,1730,9728,64330,444890,3645441, 28758111,265434293,2522822881,25717118338]