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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 53 |
| 3 | 54 |
| 4 | 2861 |
| 5 | 2915 |
| 6 | 154441 |
| 7 | 157356 |
| 8 | 8336953 |
| 9 | 8494309 |
| 10 | 450041021 |
| 11 | 458535330 |
| 12 | 24293878181 |
| 13 | 24752413511 |
| 14 | 1311419380753 |
| 15 | 1336171794264 |
| 16 | 70792352682481 |
| 17 | 72128524476745 |
| 18 | 3821475625473221 |
| 19 | 3893604149949966 |
| 20 | 206288891422871453 |
| 21 | 210182495572821419 |
[1,1,53,54,2861,2915,154441,157356,8336953, 8494309,450041021,458535330,24293878181, 24752413511,1311419380753,1336171794264, 70792352682481,72128524476745,3821475625473221, 3893604149949966,206288891422871453, 210182495572821419] |