A108204 - OEIS

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A108204 as a simple table

n	a(n)
0	0
1	1
2	2
3	6
4	30
5	216
6	2010
7	22824
8	305466
9	4704864
10	81938358
11	1591718520
12	34116485502
13	799695029808
14	20348556463482
15	558563850560184
16	16451687169853290
17	517516967826342336
18	17315898224208133494

[0,1,2,6,30,216,2010,22824,305466,4704864, 81938358,1591718520,34116485502,799695029808, 20348556463482,558563850560184,16451687169853290, 517516967826342336,17315898224208133494]