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A006602 as a simple table

n a(n)
0 2
1 1
2 2
3 5
4 20
5 180
6 16143
7 489996795
8 1392195548399980210
9 789204635842035039135545297410259322 

[2,1,2,5,20,180,16143,489996795,
 1392195548399980210,
 789204635842035039135545297410259322]

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Last modified April 16 05:35 EDT 2024. Contains 371697 sequences. (Running on oeis4.)