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A074026
as a simple table
n
a(n)
1
1
2
2
3
8
4
30
5
124
6
516
7
2232
8
9750
9
43400
10
195248
11
887784
12
4068740
13
18780048
14
87191964
[1,2,8,30,124,516,2232,9750,43400,195248,887784, 4068740,18780048,87191964]