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A217449 as a simple table

n a(n)
1 3
2 15
3 613
4 60821
5 28176327
6 45755747495
7 283827195520911

[3,15,613,60821,28176327,45755747495,
 283827195520911]

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Last modified November 29 06:32 EST 2021. Contains 349416 sequences. (Running on oeis4.)