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A075398 as a simple table

na(n)
14
28
332
4128
58192
6131072
7524288
82147483648
92305843009213693952
10618970019642690137449562112
11162259276829213363391578010288128
12170141183460469231731687303715884105728

[4,8,32,128,8192,131072,524288,2147483648,
 2305843009213693952,618970019642690137449562112,
 162259276829213363391578010288128,
 170141183460469231731687303715884105728]