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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 69 |
| 4 | 838 |
| 5 | 15673 |
| 6 | 446723 |
| 7 | 19293060 |
| 8 | 1251685959 |
| 9 | 120386313553 |
| 10 | 16900121126060 |
| 11 | 3411142115103803 |
| 12 | 977085613480027515 |
| 13 | 392874276568326733742 |
| 14 | 219743920204264577507581 |
| 15 | 169664195991510052549565897 |
| 16 | 179646979835553234783655867894 |
| 17 | 259379781267410563698300438118605 |
| 18 | 508142540645401577520522108019282903 |
[1,2,9,69,838,15673,446723,19293060,1251685959, 120386313553,16900121126060,3411142115103803, 977085613480027515,392874276568326733742, 219743920204264577507581, 169664195991510052549565897, 179646979835553234783655867894, 259379781267410563698300438118605, 508142540645401577520522108019282903] |