A163138 - OEIS

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A163138 as a simple table

n	a(n)
0	1
1	3
2	20
3	329
4	22584
5	7938470
6	12605643936
7	84977963809781
8	2379247465188706528
9	273419351336298753589802
10	128009562526607810326874017088
11	242979581192696030760182903464959706

[1,3,20,329,22584,7938470,12605643936, 84977963809781,2379247465188706528, 273419351336298753589802, 128009562526607810326874017088, 242979581192696030760182903464959706]