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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 27 |
| 2 | 463 |
| 3 | 6447 |
| 4 | 79639 |
| 5 | 910959 |
| 6 | 9884071 |
| 7 | 103247199 |
| 8 | 1048457047 |
| 9 | 10419680271 |
| 10 | 101824958599 |
| 11 | 981887319231 |
| 12 | 9367184200375 |
| 13 | 88585292286063 |
| 14 | 831747262057447 |
| 15 | 7762970817850143 |
| 16 | 72093155775104023 |
| 17 | 666700494910153935 |
[1,27,463,6447,79639,910959,9884071,103247199, 1048457047,10419680271,101824958599,981887319231, 9367184200375,88585292286063,831747262057447, 7762970817850143,72093155775104023, 666700494910153935] |