A210830 - OEIS

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A210830 as a simple table

n	a(n)
1	2
2	21
3	836
4	82199
5	19344902
6	10875989293
7	14610163237856
8	46893874745455135
9	359629516402454786058
10	6589801210450509598836041

[2,21,836,82199,19344902,10875989293, 14610163237856,46893874745455135, 359629516402454786058,6589801210450509598836041]