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A093877 as a simple table

n a(n)
1 1
2 4
3 28
4 234
5 2162
6 21272
7 218740
8 2323730
9 25314097
10 281299736
11 3176220308
12 36332751862 

[1,4,28,234,2162,21272,218740,2323730,25314097,
 281299736,3176220308,36332751862]

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Last modified June 25 07:13 EDT 2022. Contains 354835 sequences. (Running on oeis4.)