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A191508 as a simple table

na(n)
12
28
356
4792
521984
61188160
7125522112
825932064896
910472077118464
108266074697979136
1112754433913314441216
1238469498012053658897408
13226810241439860068417249280
142613967215944945112514234085376

[2,8,56,792,21984,1188160,125522112,25932064896,
 10472077118464,8266074697979136,
 12754433913314441216,38469498012053658897408,
 226810241439860068417249280,
 2613967215944945112514234085376]