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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 27 |
| 3 | 161 |
| 4 | 1083 |
| 5 | 8345 |
| 6 | 74067 |
| 7 | 754241 |
| 8 | 8726283 |
| 9 | 113375465 |
| 10 | 1635899907 |
| 11 | 25961939921 |
| 12 | 449464541883 |
| 13 | 8429731963385 |
| 14 | 170261482711347 |
| 15 | 3684531041231201 |
| 16 | 85050474868523883 |
| 17 | 2085932272336772105 |
| 18 | 54168554611721580387 |
| 19 | 1484825397108091268081 |
[1,5,27,161,1083,8345,74067,754241,8726283, 113375465,1635899907,25961939921,449464541883, 8429731963385,170261482711347,3684531041231201, 85050474868523883,2085932272336772105, 54168554611721580387,1484825397108091268081] |