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A034997
as a simple table
n
a(n)
1
2
2
6
3
32
4
370
5
11292
6
1066044
7
347326352
8
419172756930
9
1955230985997140
[2,6,32,370,11292,1066044,347326352,419172756930, 1955230985997140]