A014513 - OEIS

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A014513 as a simple table

n	a(n)
0	3
1	0
2	1
3	2
4	8
5	35
6	184
7	1155
8	8376
9	69106
10	639232
11	6552134
12	73711509
13	902965985
14	11964299312
15	170491265198
16	2599991794272
17	42249866656927
18	728810199831991
19	13300786146933842
20	256040133328476465

[3,0,1,2,8,35,184,1155,8376,69106,639232,6552134, 73711509,902965985,11964299312,170491265198, 2599991794272,42249866656927,728810199831991, 13300786146933842,256040133328476465]