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A270372 as a simple table

n a(n)
1 2
2 4
3 8
4 66
5 2776
6 20101656
7 1227318932297655
8 8216049453479522437439630860819
9 474082010892842884364582298006064172482079224559365990598026496

[2,4,8,66,2776,20101656,1227318932297655,
 8216049453479522437439630860819,
 47408201089284288436458229800606417248207922455936\
 5990598026496]

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Last modified August 8 19:29 EDT 2020. Contains 336298 sequences. (Running on oeis4.)