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A065412 as a simple table

na(n)
00
10
20
30
41
520
6480
710560
8272640
98709120
10280627200
1110644480000
12439404134400
1318781972070400
14873535419187200
1545751167221760000
162665172872986624000
17160281737951182848000
1810593163661832880128000

[0,0,0,0,1,20,480,10560,272640,8709120,280627200,
 10644480000,439404134400,18781972070400,
 873535419187200,45751167221760000,
 2665172872986624000,160281737951182848000,
 10593163661832880128000]