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A002934
as a simple table
n
a(n)
0
1
1
6
2
30
3
126
4
534
5
2214
6
9246
7
38142
8
157974
9
649086
10
2674926
[1,6,30,126,534,2214,9246,38142,157974,649086, 2674926]