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A147538 as a simple table

na(n)
12
224
3224
41920
515872
6129024
71040384
88355840
966977792
10536346624
114292870144
1234351349760
13274844352512
142198889037824
1517591649173504
16140735340871680
171125891316908032
189007164895002624
1972057456598974464
20576460202547609600

[2,24,224,1920,15872,129024,1040384,8355840,
 66977792,536346624,4292870144,34351349760,
 274844352512,2198889037824,17591649173504,
 140735340871680,1125891316908032,9007164895002624,
 72057456598974464,576460202547609600]