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A210920 as a simple table

n a(n)
1 1
2 3
3 70
4 6516
5 1741480
6 1297416720
7 2686765690144
8 15449867954722880

[1,3,70,6516,1741480,1297416720,2686765690144,
 15449867954722880]

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Last modified February 4 23:12 EST 2023. Contains 360082 sequences. (Running on oeis4.)