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| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 144 |
| 3 | 1016 |
| 4 | 6760 |
| 5 | 40230 |
| 6 | 231400 |
| 7 | 1286120 |
| 8 | 7034258 |
| 9 | 37987114 |
| 10 | 203649331 |
| 11 | 1086048101 |
| 12 | 5772562367 |
| 13 | 30611227680 |
| 14 | 162077331288 |
| 15 | 857234934742 |
| 16 | 4530655310672 |
| 17 | 23933312899024 |
| 18 | 126384275780253 |
| 19 | 667233389909168 |
[12,144,1016,6760,40230,231400,1286120,7034258, 37987114,203649331,1086048101,5772562367, 30611227680,162077331288,857234934742, 4530655310672,23933312899024,126384275780253, 667233389909168] |