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| n | a(n) |
|---|---|
| 1 | 192 |
| 2 | 576 |
| 3 | 1632 |
| 4 | 4624 |
| 5 | 13328 |
| 6 | 38416 |
| 7 | 110544 |
| 8 | 318096 |
| 9 | 913680 |
| 10 | 2624400 |
| 11 | 7549200 |
| 12 | 21715600 |
| 13 | 62425360 |
| 14 | 179452816 |
| 15 | 515960336 |
| 16 | 1483482256 |
| 17 | 4265261840 |
| 18 | 12263347600 |
| 19 | 35258287120 |
| 20 | 101370918544 |
| 21 | 291456195856 |
| 22 | 837979129744 |
| 23 | 2409294812688 |
[192,576,1632,4624,13328,38416,110544,318096, 913680,2624400,7549200,21715600,62425360, 179452816,515960336,1483482256,4265261840, 12263347600,35258287120,101370918544,291456195856, 837979129744,2409294812688] |