A189773 - OEIS

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A189773 as a simple table

n	a(n)
1	2
2	16
3	512
4	37976
5	7767740
6	3848548036
7	5404382625660
8	19742364192283882
9	203905576411742503606
10	5585800755853929115668714

[2,16,512,37976,7767740,3848548036,5404382625660, 19742364192283882,203905576411742503606, 5585800755853929115668714]