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A057734
as a simple table
n
a(n)
1
1
2
2
3
4
4
10
5
24
6
66
7
180
8
522
9
1532
10
4984
[1,2,4,10,24,66,180,522,1532,4984]
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Last modified April 19 19:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)