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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 45 |
| 3 | 609 |
| 4 | 11009 |
| 5 | 248837 |
| 6 | 6749629 |
| 7 | 213596401 |
| 8 | 7725031521 |
| 9 | 314310704101 |
| 10 | 14209394894765 |
| 11 | 706617979262049 |
| 12 | 38333841625642785 |
| 13 | 2252901018519028901 |
| 14 | 142589176837851349757 |
| 15 | 9669282207517755852721 |
| 16 | 699408060608904410296897 |
| 17 | 53752166013267632536864581 |
| 18 | 4374061543586452325644329133 |
[1,5,45,609,11009,248837,6749629,213596401, 7725031521,314310704101,14209394894765, 706617979262049,38333841625642785, 2252901018519028901,142589176837851349757, 9669282207517755852721,699408060608904410296897, 53752166013267632536864581, 4374061543586452325644329133] |