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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 117 |
| 4 | 1849 |
| 5 | 33099 |
| 6 | 648683 |
| 7 | 13652529 |
| 8 | 304828941 |
| 9 | 7160371928 |
| 10 | 175882500852 |
| 11 | 4497024667232 |
| 12 | 119255943612372 |
| 13 | 3270580645588057 |
| 14 | 92537409967439493 |
| 15 | 2695752129992788115 |
| 16 | 80716475549045336327 |
| 17 | 2480352681613911495046 |
| 18 | 78120174740199126232258 |
[1,1,9,117,1849,33099,648683,13652529,304828941, 7160371928,175882500852,4497024667232, 119255943612372,3270580645588057, 92537409967439493,2695752129992788115, 80716475549045336327,2480352681613911495046, 78120174740199126232258] |