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A222936 as a simple table

na(n)
14
216
348
4256
51024
64096
715820
865536
9262144
101048576
114182016
1216777216
1367108864
14268435456
151073476576
164294967296
1717179869184
1868719476736
19274872664064
201099511627776
214398046511104
2217592186044416
2370368643424320

[4,16,48,256,1024,4096,15820,65536,262144,1048576,
 4182016,16777216,67108864,268435456,1073476576,
 4294967296,17179869184,68719476736,274872664064,
 1099511627776,4398046511104,17592186044416,
 70368643424320]