A168663 - OEIS

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A168663 as a simple table

n	a(n)
0	0
1	1
2	4160
3	798255
4	33562624
5	610390625
6	6530486976
7	48444916975
8	274878955520
9	1270935305649
10	5000005000000
11	17261365815551
12	53496620605440
13	151437584670385
14	396857439333824
15	973097619609375
16	2251799947902976

[0,1,4160,798255,33562624,610390625,6530486976, 48444916975,274878955520,1270935305649, 5000005000000,17261365815551,53496620605440, 151437584670385,396857439333824,973097619609375, 2251799947902976]