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A301802
as a simple table
n
a(n)
0
1
1
1
2
2
3
4
4
18
5
48
6
216
7
584
8
2870
9
10408
10
45244
11
160248
12
762554
[1,1,2,4,18,48,216,584,2870,10408,45244,160248, 762554]