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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 13 |
| 3 | 41 |
| 4 | 991 |
| 5 | 5461 |
| 6 | 194713 |
| 7 | 1545265 |
| 8 | 73022131 |
| 9 | 758924981 |
| 10 | 44709567013 |
| 11 | 575279386969 |
| 12 | 40614439994311 |
| 13 | 623479972408021 |
| 14 | 51316625644764721 |
| 15 | 915589327332039905 |
| 16 | 86090052046429522747 |
| 17 | 1750836276286883890741 |
[1,1,13,41,991,5461,194713,1545265,73022131, 758924981,44709567013,575279386969,40614439994311, 623479972408021,51316625644764721, 915589327332039905,86090052046429522747, 1750836276286883890741] |