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| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 36 |
| 3 | 144 |
| 4 | 540 |
| 5 | 2052 |
| 6 | 7776 |
| 7 | 29484 |
| 8 | 111780 |
| 9 | 423792 |
| 10 | 1606716 |
| 11 | 6091524 |
| 12 | 23094720 |
| 13 | 87558732 |
| 14 | 331960356 |
| 15 | 1258557264 |
| 16 | 4771552860 |
| 17 | 18090330372 |
| 18 | 68585649696 |
| 19 | 260027940204 |
| 20 | 985840769700 |
| 21 | 3737606129712 |
| 22 | 14170340698236 |
| 23 | 53723840483844 |
[12,36,144,540,2052,7776,29484,111780,423792, 1606716,6091524,23094720,87558732,331960356, 1258557264,4771552860,18090330372,68585649696, 260027940204,985840769700,3737606129712, 14170340698236,53723840483844] |