A012804 - OEIS

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A012804 as a simple table

n	a(n)
0	1
1	3
2	65
3	2051
4	154209
5	14263139
6	2239618017
7	411001918627
8	110281957937729
9	33549045899804227
10	13741520797366881025
11	6244634409478025568963
12	3628509505783902549611425
13	2300839492251656581442561187

[1,3,65,2051,154209,14263139,2239618017, 411001918627,110281957937729,33549045899804227, 13741520797366881025,6244634409478025568963, 3628509505783902549611425, 2300839492251656581442561187]