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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 13 |
| 3 | 80 |
| 4 | 645 |
| 5 | 6466 |
| 6 | 77653 |
| 7 | 1087414 |
| 8 | 17400009 |
| 9 | 313208098 |
| 10 | 6264212481 |
| 11 | 137813028374 |
| 12 | 3307515383741 |
| 13 | 85995422345522 |
| 14 | 2407872025035597 |
| 15 | 72236162654825222 |
| 16 | 2311557224345919249 |
| 17 | 78592945837626597442 |
| 18 | 2829346052559437183353 |
| 19 | 107515150026347498080246 |
[1,3,13,80,645,6466,77653,1087414,17400009, 313208098,6264212481,137813028374,3307515383741, 85995422345522,2407872025035597,72236162654825222, 2311557224345919249,78592945837626597442, 2829346052559437183353,107515150026347498080246] |