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A015209 as a simple table

n a(n)
0 1
1 2
2 21
3 688
4 123827
5 72470454
6 234124353817
7 2465349491066876
8 143340549850680842079
9 27168340876252989570097858
10 28432984085878392152571573148709
11 97003727566351469067244149247119170952 

[1,2,21,688,123827,72470454,234124353817,
 2465349491066876,143340549850680842079,
 27168340876252989570097858,
 28432984085878392152571573148709,
 97003727566351469067244149247119170952]

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Last modified April 24 12:31 EDT 2024. Contains 371937 sequences. (Running on oeis4.)