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A003380 as a simple table

na(n)
12
2257
3512
46562
56817
613122
765537
865792
972097
10131072
11390626
12390881
13397186
14456161
15781250
161679617
171679872
181686177
191745152
202070241
213359232
225764802
235765057
245771362
255830337
266155426
277444417
2811529602
2916777217
3016777472
3116783777
3216842752

[2,257,512,6562,6817,13122,65537,65792,72097,
 131072,390626,390881,397186,456161,781250,1679617,
 1679872,1686177,1745152,2070241,3359232,5764802,
 5765057,5771362,5830337,6155426,7444417,11529602,
 16777217,16777472,16783777,16842752]