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A012539 as a simple table

na(n)
02
18
2200
39088
4573088
554743680
67549206912
71418652930048
8349780182483456
9109789748881688576
1042770510180602898432
1120248998750034801098752
1211448712479091073092919296

[2,8,200,9088,573088,54743680,7549206912,
 1418652930048,349780182483456,109789748881688576,
 42770510180602898432,20248998750034801098752,
 11448712479091073092919296]