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A169970
as a simple table
n
a(n)
0
1
1
1
2
2
3
2
4
6
5
8
6
28
7
48
8
244
9
476
10
2544
11
5952
12
35600
13
94456
14
659632
15
1984176
16
15106128
17
51493696
[1,1,2,2,6,8,28,48,244,476,2544,5952,35600,94456, 659632,1984176,15106128,51493696]