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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 32767 |
| 3 | 7174453 |
| 4 | 357913941 |
| 5 | 7629394531 |
| 6 | 94036996915 |
| 7 | 791260251657 |
| 8 | 5026338869833 |
| 9 | 25736391511831 |
| 10 | 111111111111111 |
| 11 | 417724816941565 |
| 12 | 1400638324962397 |
| 13 | 4265491084507563 |
| 14 | 11966776581370171 |
| 15 | 31278135027204241 |
| 16 | 76861433640456465 |
| 17 | 178901440719363487 |
[1,15,32767,7174453,357913941,7629394531, 94036996915,791260251657,5026338869833, 25736391511831,111111111111111,417724816941565, 1400638324962397,4265491084507563, 11966776581370171,31278135027204241, 76861433640456465,178901440719363487] |