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| n | a(n) |
|---|---|
| 1 | 8688 |
| 2 | 33048 |
| 3 | 126456 |
| 4 | 469376 |
| 5 | 1618264 |
| 6 | 4985336 |
| 7 | 17080712 |
| 8 | 60483408 |
| 9 | 214599288 |
| 10 | 752272724 |
| 11 | 2563107328 |
| 12 | 8854381384 |
| 13 | 31053941712 |
| 14 | 109232749860 |
| 15 | 383284939872 |
| 16 | 1337155562472 |
| 17 | 4669185534048 |
| 18 | 16386702006492 |
| 19 | 57650707026736 |
[8688,33048,126456,469376,1618264,4985336, 17080712,60483408,214599288,752272724,2563107328, 8854381384,31053941712,109232749860,383284939872, 1337155562472,4669185534048,16386702006492, 57650707026736] |