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A221667 as a simple table

na(n)
14
212
364
4256
5992
64096
716384
865344
9262144
101048576
114193280
1216777216
1367108864
14268430336
151073741824
164294967296
1717179844608
1868719476736
19274877906944
201099511513088
214398046511104
2217592186044416
2370368743653376

[4,12,64,256,992,4096,16384,65344,262144,1048576,
 4193280,16777216,67108864,268430336,1073741824,
 4294967296,17179844608,68719476736,274877906944,
 1099511513088,4398046511104,17592186044416,
 70368743653376]