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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 69 |
| 5 | 626 |
| 6 | 7866 |
| 7 | 117650 |
| 8 | 2101265 |
| 9 | 43047451 |
| 10 | 1000390658 |
| 11 | 25937424602 |
| 12 | 743069105634 |
| 13 | 23298085122482 |
| 14 | 793728614541474 |
| 15 | 29192926269590300 |
| 16 | 1152925902670135553 |
| 17 | 48661191875666868482 |
| 18 | 2185913413229070900339 |
| 19 | 104127350297911241532842 |
[1,3,10,69,626,7866,117650,2101265,43047451, 1000390658,25937424602,743069105634, 23298085122482,793728614541474,29192926269590300, 1152925902670135553,48661191875666868482, 2185913413229070900339,104127350297911241532842] |