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A037896 as a simple table

na(n)
12
217
3257
41297
565537
6160001
7331777
8614657
91336337
104477457
115308417
128503057
139834497
1429986577
1540960001
1645212177
1759969537
1865610001
19126247697
20193877777
21303595777
22384160001
23406586897
24562448657
25655360001

[2,17,257,1297,65537,160001,331777,614657,1336337,
 4477457,5308417,8503057,9834497,29986577,40960001,
 45212177,59969537,65610001,126247697,193877777,
 303595777,384160001,406586897,562448657,655360001]