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A053572 as a simple table

n a(n)
0 1
1 1
2 1
3 3
4 16
5 75
6 384
7 1805
8 8640
9 42336
10 207368
11 995808
12 5184000
13 24192672
14 121730700
15 594350400
16 2921811200

[1,1,1,3,16,75,384,1805,8640,42336,207368,995808,
 5184000,24192672,121730700,594350400,2921811200]

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Last modified March 20 16:16 EDT 2019. Contains 321345 sequences. (Running on oeis4.)