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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 24 |
| 2 | 448 |
| 3 | 9216 |
| 4 | 192512 |
| 5 | 4030464 |
| 6 | 84410368 |
| 7 | 1767899136 |
| 8 | 37027315712 |
| 9 | 775510032384 |
| 10 | 16242492571648 |
| 11 | 340187179646976 |
| 12 | 7124972786941952 |
| 13 | 149227367389200384 |
| 14 | 3125458558976524288 |
| 15 | 65460453902527758336 |
| 16 | 1371021545886168645632 |
| 17 | 28715048051506270961664 |
[2,24,448,9216,192512,4030464,84410368,1767899136, 37027315712,775510032384,16242492571648, 340187179646976,7124972786941952, 149227367389200384,3125458558976524288, 65460453902527758336,1371021545886168645632, 28715048051506270961664] |