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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 131071 |
| 3 | 64570081 |
| 4 | 8589869056 |
| 5 | 190734863281 |
| 6 | 8463265086751 |
| 7 | 38771752331201 |
| 8 | 562945658454016 |
| 9 | 2779530261754401 |
| 10 | 24999809265103951 |
| 11 | 50544702849929377 |
| 12 | 554648540725313536 |
| 13 | 720867993281778161 |
| 14 | 5081852349802846271 |
[1,131071,64570081,8589869056,190734863281, 8463265086751,38771752331201,562945658454016, 2779530261754401,24999809265103951, 50544702849929377,554648540725313536, 720867993281778161,5081852349802846271] |