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A092978 as a simple table

na(n)
12
28
316
4128
5256
63072
76144
898304
9196608
103932160
117864320
12188743680
1325165824
14704643072
1521139292160
16676457349120
171352914698240
1848704929136640
194638564679680
20185542587187200
217792788661862400

[2,8,16,128,256,3072,6144,98304,196608,3932160,
 7864320,188743680,25165824,704643072,21139292160,
 676457349120,1352914698240,48704929136640,
 4638564679680,185542587187200,7792788661862400]