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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 1752 |
| 3 | 64560 |
| 4 | 516928 |
| 5 | 16534784 |
| 6 | 45899840 |
| 7 | 2762956252 |
| 8 | 2818822376 |
| 9 | 415652059980 |
| 10 | 163088180880 |
| 11 | 58352627572340 |
| 12 | 9240725160960 |
| 13 | 7903320200155840 |
| 14 | 527212884271456 |
| 15 | 1048584505666800960 |
[81,1752,64560,516928,16534784,45899840, 2762956252,2818822376,415652059980,163088180880, 58352627572340,9240725160960,7903320200155840, 527212884271456,1048584505666800960] |