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A224993 as a simple table

na(n)
01
14
232
3352
44736
572832
61226240
721948928
8409192448
97833143296
10152494727168
113000118779904
1259406517698560
131180988766453760
1423534128521936896
15469655122210324480
169380774946206646272
17187467580232576794624
183747576648059504820224

[1,4,32,352,4736,72832,1226240,21948928,409192448,
 7833143296,152494727168,3000118779904,
 59406517698560,1180988766453760,23534128521936896,
 469655122210324480,9380774946206646272,
 187467580232576794624,3747576648059504820224]