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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 18 |
| 3 | 24 |
| 4 | 408 |
| 5 | 7684 |
| 6 | 10848 |
| 7 | 14528 |
| 8 | 46272 |
| 9 | 533776 |
| 10 | 774912 |
| 11 | 201142272 |
| 12 | 1410521344 |
| 13 | 3220488192 |
| 14 | 4469373184 |
| 15 | 6505814272 |
| 16 | 27945013504 |
[9,18,24,408,7684,10848,14528,46272,533776,774912, 201142272,1410521344,3220488192,4469373184, 6505814272,27945013504] |