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A074441 as a simple table

na(n)
10
20
30
46
560
6300
71296
86048
930240
10159408
11883872
125018112
1328304640
14157697280
15876311654
164895520768
1727554100480
18156139902720
19889181991936
205078255822436
2129046943180800
22166354131141818
23954240788994048
245484206701412352
2531581437286776820

[0,0,0,6,60,300,1296,6048,30240,159408,883872,
 5018112,28304640,157697280,876311654,4895520768,
 27554100480,156139902720,889181991936,
 5078255822436,29046943180800,166354131141818,
 954240788994048,5484206701412352,
 31581437286776820]