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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 81 |
| 4 | 649 |
| 5 | 5194 |
| 6 | 41553 |
| 7 | 332425 |
| 8 | 2659402 |
| 9 | 21275217 |
| 10 | 170201737 |
| 11 | 1361613898 |
| 12 | 10892911185 |
| 13 | 87143289481 |
| 14 | 697146315850 |
| 15 | 5577170526801 |
| 16 | 44617364214409 |
| 17 | 356938913715274 |
| 18 | 2855511309722193 |
[1,10,81,649,5194,41553,332425,2659402,21275217, 170201737,1361613898,10892911185,87143289481, 697146315850,5577170526801,44617364214409, 356938913715274,2855511309722193] |