A263417 - OEIS

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A263417 as a simple table

n	a(n)
0	1
1	2
2	20
3	1600
4	1408000
5	17346560000
6	3633063526400000
7	15218176499384320000000
8	1466155647574283911168000000000
9	3672576800382377947366110003200000000000
10	266783946802402043703868836144710942720000000000000

[1,2,20,1600,1408000,17346560000,3633063526400000, 15218176499384320000000, 1466155647574283911168000000000, 3672576800382377947366110003200000000000, 26678394680240204370386883614471094272000000000000\ 0]