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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 16 |
| 3 | 31 |
| 4 | 481 |
| 5 | 29853 |
| 6 | 448276 |
| 7 | 478129 |
| 8 | 926405 |
| 9 | 14374204 |
| 10 | 892127053 |
| 11 | 13396279999 |
| 12 | 14288407052 |
| 13 | 27684687051 |
| 14 | 429558712817 |
| 15 | 26660324881705 |
| 16 | 400334431938392 |
| 17 | 426994756820097 |
| 18 | 827329188758489 |
| 19 | 12836932588197432 |
| 20 | 796717149656999273 |
| 21 | 11963594177443186527 |
[1,15,16,31,481,29853,448276,478129,926405, 14374204,892127053,13396279999,14288407052, 27684687051,429558712817,26660324881705, 400334431938392,426994756820097,827329188758489, 12836932588197432,796717149656999273, 11963594177443186527] |