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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 31 |
| 3 | 1341 |
| 4 | 59917 |
| 5 | 2665884 |
| 6 | 117939506 |
| 7 | 5201391077 |
| 8 | 229151753951 |
| 9 | 10097407871079 |
| 10 | 445314691051823 |
| 11 | 19662213285986440 |
| 12 | 869281482750346782 |
| 13 | 38482251447081815180 |
| 14 | 1705762097183926444500 |
| 15 | 75702251155478791228341 |
| 16 | 3363573441149092994645423 |
[1,1,31,1341,59917,2665884,117939506,5201391077, 229151753951,10097407871079,445314691051823, 19662213285986440,869281482750346782, 38482251447081815180,1705762097183926444500, 75702251155478791228341,3363573441149092994645423] |