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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 474 |
| 3 | 2741 |
| 4 | 15948 |
| 5 | 93093 |
| 6 | 541880 |
| 7 | 3152844 |
| 8 | 18356756 |
| 9 | 106893088 |
| 10 | 622285828 |
| 11 | 3622715432 |
| 12 | 21091482008 |
| 13 | 122794559800 |
| 14 | 714891615808 |
| 15 | 4162016007648 |
| 16 | 24230928689312 |
| 17 | 141070302809152 |
| 18 | 821296712783104 |
| 19 | 4781509809549568 |
[81,474,2741,15948,93093,541880,3152844,18356756, 106893088,622285828,3622715432,21091482008, 122794559800,714891615808,4162016007648, 24230928689312,141070302809152,821296712783104, 4781509809549568] |