The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 15 |
| 3 | 154 |
| 4 | 1995 |
| 5 | 31191 |
| 6 | 571221 |
| 7 | 11992688 |
| 8 | 283976517 |
| 9 | 7487521975 |
| 10 | 217567092743 |
| 11 | 6907888374828 |
| 12 | 237951469523807 |
| 13 | 8838510559556783 |
| 14 | 352160268261051113 |
| 15 | 14982705940607112640 |
| 16 | 677935029521206050505 |
| 17 | 32508195354031791206799 |
[2,15,154,1995,31191,571221,11992688,283976517, 7487521975,217567092743,6907888374828, 237951469523807,8838510559556783, 352160268261051113,14982705940607112640, 677935029521206050505,32508195354031791206799] |