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A170006 as a simple table

na(n)
01
145
21980
387120
43833280
5168664320
67421230080
7326534123520
814367501434880
9632170063134720
1027815482777927680
111223881242228817920
1253850774658067988480
132369434084954991493120
14104255099738019625697280

[1,45,1980,87120,3833280,168664320,7421230080,
 326534123520,14367501434880,632170063134720,
 27815482777927680,1223881242228817920,
 53850774658067988480,2369434084954991493120,
 104255099738019625697280]