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A007221 as a simple table

n a(n)
8 6
9 216
10 3706
11 44060
12 417486
13 3386912
14 24554562
15 163587572
16 1020918342
17 6050527496
18 34395992698
19 188971062108
20 1009130882494
21 5261414979024 

[6,216,3706,44060,417486,3386912,24554562,
 163587572,1020918342,6050527496,34395992698,
 188971062108,1009130882494,5261414979024]

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Last modified April 24 00:30 EDT 2024. Contains 371917 sequences. (Running on oeis4.)