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| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 144 |
| 3 | 811 |
| 4 | 6837 |
| 5 | 55088 |
| 6 | 410000 |
| 7 | 3227589 |
| 8 | 25102409 |
| 9 | 193788386 |
| 10 | 1507133620 |
| 11 | 11693492167 |
| 12 | 90677582325 |
| 13 | 703826743120 |
| 14 | 5460755855460 |
| 15 | 42367807894797 |
| 16 | 328752895890725 |
| 17 | 2550786798536934 |
| 18 | 19791666524580132 |
| 19 | 153566455887582047 |
[12,144,811,6837,55088,410000,3227589,25102409, 193788386,1507133620,11693492167,90677582325, 703826743120,5460755855460,42367807894797, 328752895890725,2550786798536934, 19791666524580132,153566455887582047] |