A099705 - OEIS

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A099705 as a simple table

n	a(n)
0	1
1	4
2	60
3	2040
4	188080
5	74164384
6	140677401088
7	1132868741554944
8	36957109369822385664
9	4838033391155896811513344

[1,4,60,2040,188080,74164384,140677401088, 1132868741554944,36957109369822385664, 4838033391155896811513344]