A168554 - OEIS

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A168554 as a simple table

n	a(n)
0	1
1	2
2	28
3	2304
4	856576
5	1351057408
6	8846893121536
7	238036693238677504
8	26163011929227894194176
9	11701653843176682031379644416
10	21237338088859808279441141143699456

[1,2,28,2304,856576,1351057408,8846893121536, 238036693238677504,26163011929227894194176, 11701653843176682031379644416, 21237338088859808279441141143699456]