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A001337 as a simple table

na(n)
10
20
348
4264
51680
611640
786352
8673104
95424768
1044828400
11377810928
123235366752
1328074857616
14246353214240
152182457514960
1619495053028800
17175405981214592

[0,0,48,264,1680,11640,86352,673104,5424768,
 44828400,377810928,3235366752,28074857616,
 246353214240,2182457514960,19495053028800,
 175405981214592]