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A068200 as a simple table

n a(n)
0 1
1 2
2 6
3 24
4 120
5 696
6 4536
7 32568
8 254136
9 2133816
10 19130040

[1,2,6,24,120,696,4536,32568,254136,2133816,
 19130040]

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Last modified August 4 15:50 EDT 2020. Contains 336202 sequences. (Running on oeis4.)