A167002 - OEIS

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A167002 as a simple table

n	a(n)
0	1
1	4
2	20
3	320
4	21064
5	5030400
6	4056470528
7	10872157339648
8	98162974155542592
9	3052890463194814939136
10	334052589949087491382968320
11	130858881562759880830581892710400

[1,4,20,320,21064,5030400,4056470528, 10872157339648,98162974155542592, 3052890463194814939136, 334052589949087491382968320, 130858881562759880830581892710400]