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A086490
as a simple table
n
a(n)
1
2
2
18
3
35
4
66
5
4
6
84
7
344
8
1692
9
1785
10
270
11
4293
12
1176
13
9315
14
1458
15
3450
16
5304
17
2656
[2,18,35,66,4,84,344,1692,1785,270,4293,1176,9315, 1458,3450,5304,2656]