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A156522 as a simple table

n a(n)
2 4
3 18
4 372
5 16404
6 5141900
7 9054510666
8 197569263663408
9 15383832371115704364

[4,18,372,16404,5141900,9054510666,
 197569263663408,15383832371115704364]

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Last modified April 19 14:10 EDT 2024. Contains 371792 sequences. (Running on oeis4.)