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| n | a(n) |
|---|---|
| 8 | 1 |
| 9 | 15 |
| 10 | 133 |
| 11 | 912 |
| 12 | 5358 |
| 13 | 28405 |
| 14 | 140049 |
| 15 | 654588 |
| 16 | 2937932 |
| 17 | 12776589 |
| 18 | 54190390 |
| 19 | 225253075 |
| 20 | 921000186 |
| 21 | 3714710824 |
| 22 | 14812754293 |
| 23 | 58500857880 |
| 24 | 229151753951 |
| 25 | 891294490555 |
| 26 | 3445626506596 |
| 27 | 13249653746017 |
| 28 | 50712356284429 |
| 29 | 193300937950441 |
| 30 | 734118443975314 |
| 31 | 2778953915499832 |
[1,15,133,912,5358,28405,140049,654588,2937932, 12776589,54190390,225253075,921000186,3714710824, 14812754293,58500857880,229151753951,891294490555, 3445626506596,13249653746017,50712356284429, 193300937950441,734118443975314,2778953915499832] |