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A089415
as a simple table
n
a(n)
0
1
1
1
2
2
3
6
4
12
5
870
6
13580
7
10962
8
20425900
9
1127689920
[1,1,2,6,12,870,13580,10962,20425900,1127689920]
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Last modified April 24 19:59 EDT 2024. Contains 371963 sequences. (Running on oeis4.)