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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 13 |
| 3 | 83 |
| 4 | 389 |
| 5 | 1561 |
| 6 | 5808 |
| 7 | 21608 |
| 8 | 81280 |
| 9 | 302869 |
| 10 | 1103582 |
| 11 | 3937976 |
| 12 | 13827871 |
| 13 | 47923048 |
| 14 | 164209208 |
[1,13,83,389,1561,5808,21608,81280,302869,1103582, 3937976,13827871,47923048,164209208] |