A013356 - OEIS

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A013356 as a simple table

n	a(n)
0	3
1	15
2	273
3	15495
4	977493
5	88854675
6	10671316113
7	1617243395055
8	303182522321133
9	68820502388338635
10	18601481181446108553
11	5903132077554100349415
12	2173055397496643301830373

[3,15,273,15495,977493,88854675,10671316113, 1617243395055,303182522321133,68820502388338635, 18601481181446108553,5903132077554100349415, 2173055397496643301830373]