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A074445 as a simple table

na(n)
10
20
32
412
560
6300
71296
85616
928080
10155520
11883872
125018112
1328304640
14158130514
15878719104
164899999744
1727554100480
18156139902720
19889181991936
205077739844402
2129043991855542
22166348496793600
23954240788994048
245484206701412352
2531581437286776820

[0,0,2,12,60,300,1296,5616,28080,155520,883872,
 5018112,28304640,158130514,878719104,4899999744,
 27554100480,156139902720,889181991936,
 5077739844402,29043991855542,166348496793600,
 954240788994048,5484206701412352,
 31581437286776820]