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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 7 |
| 2 | 24 |
| 3 | 82 |
| 4 | 280 |
| 5 | 956 |
| 6 | 3264 |
| 7 | 11144 |
| 8 | 38048 |
| 9 | 129904 |
| 10 | 443520 |
| 11 | 1514272 |
| 12 | 5170048 |
[2,7,24,82,280,956,3264,11144,38048,129904,443520, 1514272,5170048] |