A014336 - OEIS

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A014336 as a simple table

n	a(n)
0	0
1	0
2	0
3	6
4	36
5	210
6	1080
7	5460
8	26964
9	132294
10	645480
11	3142590
12	15277680
13	74222616
14	360445176
15	1750067430
16	8496115740
17	41243946330
18	200209950504
19	971859585804
20	4717557894060
21	22899644483430
22	111157568501760

[0,0,0,6,36,210,1080,5460,26964,132294,645480, 3142590,15277680,74222616,360445176,1750067430, 8496115740,41243946330,200209950504,971859585804, 4717557894060,22899644483430,111157568501760]