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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 218 |
| 3 | 1284 |
| 4 | 7770 |
| 5 | 46702 |
| 6 | 286770 |
| 7 | 1767266 |
| 8 | 10830650 |
| 9 | 66701686 |
| 10 | 410364610 |
| 11 | 2522566124 |
| 12 | 15524673872 |
| 13 | 95489164864 |
| 14 | 587352257166 |
| 15 | 3613537440642 |
| 16 | 22227593479382 |
| 17 | 136734516680534 |
| 18 | 841147631122416 |
| 19 | 5174280907720634 |
[8,218,1284,7770,46702,286770,1767266,10830650, 66701686,410364610,2522566124,15524673872, 95489164864,587352257166,3613537440642, 22227593479382,136734516680534,841147631122416, 5174280907720634] |