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A054091 as a simple table

na(n)
01
12
24
310
432
5130
6652
73914
827400
9219202
101972820
1119728202
12217010224
132604122690
1433853594972
15473950329610
167109254944152
17113748079106434
181933717344809380
1934806912206568842
20661331331924808000
2113226626638496160002
22277759159408419360044

[1,2,4,10,32,130,652,3914,27400,219202,1972820,
 19728202,217010224,2604122690,33853594972,
 473950329610,7109254944152,113748079106434,
 1933717344809380,34806912206568842,
 661331331924808000,13226626638496160002,
 277759159408419360044]