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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 8 |
| 2 | 32 |
| 3 | 218 |
| 4 | 2312 |
| 5 | 30068 |
| 6 | 510512 |
| 7 | 9699908 |
| 8 | 223092902 |
| 9 | 6469695548 |
| 10 | 200560490132 |
| 11 | 7420738165088 |
| 12 | 304250263527212 |
| 13 | 13082761332180548 |
| 14 | 614889782588493752 |
| 15 | 32589158477199744638 |
| 16 | 1922760350154212639072 |
[2,8,32,218,2312,30068,510512,9699908,223092902, 6469695548,200560490132,7420738165088, 304250263527212,13082761332180548, 614889782588493752,32589158477199744638, 1922760350154212639072] |