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A336544
as a simple table
n
a(n)
1
1
2
2
3
6
4
20
5
90
6
544
7
5096
8
79220
9
2208158
10
113737744
11
10926144928
[1,2,6,20,90,544,5096,79220,2208158,113737744, 10926144928]