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A173098 as a simple table

n a(n)
1 1
2 2
3 2
4 6
5 18
6 198
7 6930
8 2737350
9 37936933650
10 207693292716721350
11 15758493330480878908260133650
12 6545866736124132578837836330405530973356721350 

[1,2,2,6,18,198,6930,2737350,37936933650,
 207693292716721350,15758493330480878908260133650,
 6545866736124132578837836330405530973356721350]

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Last modified August 27 15:02 EDT 2024. Contains 375470 sequences. (Running on oeis4.)