A014505 - OEIS

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A014505 as a simple table

n	a(n)
0	1
1	1
2	6
3	68
4	1206
5	29982
6	981476
7	40515568
8	2044492988
9	123175320988
10	8697475219688
11	709097832452880
12	65934837808883016
13	6920436929999656936
14	812724019581549433520
15	105986960037601701495680

[1,1,6,68,1206,29982,981476,40515568,2044492988, 123175320988,8697475219688,709097832452880, 65934837808883016,6920436929999656936, 812724019581549433520,105986960037601701495680]