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A241208
as a simple table
n
a(n)
1
2
2
4
3
12
4
36
5
96
6
288
7
836
8
2412
9
7000
10
20404
11
59256
12
172236
13
500776
14
1455908
15
4232288
16
12305028
[2,4,12,36,96,288,836,2412,7000,20404,59256, 172236,500776,1455908,4232288,12305028]