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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 14 |
| 3 | 170 |
| 4 | 2198 |
| 5 | 28562 |
| 6 | 371294 |
| 7 | 4826810 |
| 8 | 62748518 |
| 9 | 815730722 |
| 10 | 10604499374 |
| 11 | 137858491850 |
| 12 | 1792160394038 |
| 13 | 23298085122482 |
| 14 | 302875106592254 |
| 15 | 3937376385699290 |
| 16 | 51185893014090758 |
[0,2,14,170,2198,28562,371294,4826810,62748518, 815730722,10604499374,137858491850,1792160394038, 23298085122482,302875106592254,3937376385699290, 51185893014090758] |