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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 39 |
| 3 | 156 |
| 4 | 624 |
| 5 | 2496 |
| 6 | 9984 |
| 7 | 39936 |
| 8 | 159744 |
| 9 | 638976 |
| 10 | 2555904 |
| 11 | 10223616 |
| 12 | 40894464 |
| 13 | 163577856 |
| 14 | 654311424 |
| 15 | 2617245696 |
| 16 | 10468982784 |
| 17 | 41875931136 |
| 18 | 167503724544 |
| 19 | 670014898176 |
| 20 | 2680059592704 |
| 21 | 10720238370816 |
| 22 | 42880953483264 |
| 23 | 171523813933056 |
| 24 | 686095255732224 |
[3,39,156,624,2496,9984,39936,159744,638976, 2555904,10223616,40894464,163577856,654311424, 2617245696,10468982784,41875931136,167503724544, 670014898176,2680059592704,10720238370816, 42880953483264,171523813933056,686095255732224] |