A223570 - OEIS

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A223570 as a simple table

n	a(n)
1	3
2	81
3	16038
4	16230456
5	64207683936
6	817235401137408
7	28907250609032395776
8	2535541672670058530700288
9	503424192483622111094950081536
10	209983768351036102380925723459562496

[3,81,16038,16230456,64207683936,817235401137408, 28907250609032395776,2535541672670058530700288, 503424192483622111094950081536, 209983768351036102380925723459562496]