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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 89 |
| 4 | 1430 |
| 5 | 23070 |
| 6 | 372259 |
| 7 | 6006853 |
| 8 | 96927945 |
| 9 | 1564051382 |
| 10 | 25237889117 |
| 11 | 407244323586 |
| 12 | 6571387104706 |
| 13 | 106037398138915 |
| 14 | 1711043593219257 |
| 15 | 27609788897887265 |
| 16 | 445517838357152822 |
| 17 | 7188977251094395521 |
| 18 | 116002973320502471614 |
| 19 | 1871850382771577632966 |
[1,6,89,1430,23070,372259,6006853,96927945, 1564051382,25237889117,407244323586,6571387104706, 106037398138915,1711043593219257, 27609788897887265,445517838357152822, 7188977251094395521,116002973320502471614, 1871850382771577632966] |