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A151808
as a simple table
n
a(n)
1
2
2
4
3
21
4
330
5
14610
6
1820715
7
653629616
8
696496706166
9
2213581411047749
10
19866756948798084481
[2,4,21,330,14610,1820715,653629616,696496706166, 2213581411047749,19866756948798084481]
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Last modified April 19 19:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)