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| n | a(n) |
|---|---|
| 1 | 518 |
| 2 | 3318 |
| 3 | 25062 |
| 4 | 181308 |
| 5 | 1284808 |
| 6 | 9172142 |
| 7 | 65613880 |
| 8 | 467877898 |
| 9 | 3342085566 |
| 10 | 23863144636 |
| 11 | 170361773052 |
| 12 | 1216457665598 |
| 13 | 8685298245814 |
| 14 | 62011878783818 |
| 15 | 442766165059484 |
| 16 | 3161297854578070 |
| 17 | 22571505980125104 |
| 18 | 161159074186279688 |
[518,3318,25062,181308,1284808,9172142,65613880, 467877898,3342085566,23863144636,170361773052, 1216457665598,8685298245814,62011878783818, 442766165059484,3161297854578070, 22571505980125104,161159074186279688] |