A158988 - OEIS

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A158988 as a simple table

n	a(n)
1	4
2	16
3	64
4	128
5	6912
6	24576
7	16384
8	786432
9	524288
10	50096498540544
11	3764488749034090683017723904
12	167633515663893895281332936606596215078912

[4,16,64,128,6912,24576,16384,786432,524288, 50096498540544,3764488749034090683017723904, 167633515663893895281332936606596215078912]