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A215956 as a simple table

n a(n)
1 2
2 12
3 366
4 6150
5 847594
6 30312074
7 10289785215
8 609400419815
9 392670408857828
10 33926900616984192
11 35986649547821568686 

[2,12,366,6150,847594,30312074,10289785215,
 609400419815,392670408857828,33926900616984192,
 35986649547821568686]

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Last modified June 25 12:30 EDT 2022. Contains 354851 sequences. (Running on oeis4.)