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A003182
as a simple table
n
a(n)
0
2
1
3
2
5
3
10
4
30
5
210
6
16353
7
490013148
8
1392195548889993358
9
789204635842035040527740846300252680
[2,3,5,10,30,210,16353,490013148, 1392195548889993358, 789204635842035040527740846300252680]