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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 537 |
| 3 | 3199 |
| 4 | 17837 |
| 5 | 95679 |
| 6 | 498597 |
| 7 | 2546207 |
| 8 | 12796069 |
| 9 | 63520287 |
| 10 | 312150917 |
| 11 | 1521435839 |
| 12 | 7364501157 |
| 13 | 35440920159 |
| 14 | 169704498117 |
| 15 | 809104150911 |
| 16 | 3843034229093 |
| 17 | 18192875333663 |
| 18 | 85871684446085 |
| 19 | 404259277931583 |
[81,537,3199,17837,95679,498597,2546207,12796069, 63520287,312150917,1521435839,7364501157, 35440920159,169704498117,809104150911, 3843034229093,18192875333663,85871684446085, 404259277931583] |