The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 253 |
| 3 | 6981 |
| 4 | 42231 |
| 5 | 717585 |
| 6 | 5940377 |
| 7 | 80892559 |
| 8 | 781927421 |
| 9 | 9569579009 |
| 10 | 99563194119 |
| 11 | 1158353288989 |
| 12 | 12479863472959 |
| 13 | 141758613941473 |
| 14 | 1552733071485933 |
| 15 | 17438598795150161 |
| 16 | 192510267581544599 |
[81,253,6981,42231,717585,5940377,80892559, 781927421,9569579009,99563194119,1158353288989, 12479863472959,141758613941473,1552733071485933, 17438598795150161,192510267581544599] |