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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 16 |
| 4 | 21 |
| 5 | 226 |
| 6 | 247 |
| 7 | 967 |
| 8 | 4115 |
| 9 | 5082 |
| 10 | 288707 |
| 11 | 293789 |
| 12 | 1463863 |
| 13 | 4685378 |
| 14 | 6149241 |
| 15 | 66177788 |
| 16 | 72327029 |
| 17 | 283158875 |
| 18 | 1204962529 |
| 19 | 1488121404 |
| 20 | 84539761153 |
| 21 | 86027882557 |
| 22 | 428651291381 |
| 23 | 1371981756700 |
| 24 | 1800633048081 |
| 25 | 19378312237510 |
| 26 | 21178945285591 |
| 27 | 82915148094283 |
[1,1,5,16,21,226,247,967,4115,5082,288707,293789, 1463863,4685378,6149241,66177788,72327029, 283158875,1204962529,1488121404,84539761153, 86027882557,428651291381,1371981756700, 1800633048081,19378312237510,21178945285591, 82915148094283] |