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| n | a(n) |
|---|---|
| 0 | -1 |
| 1 | 5 |
| 2 | 43 |
| 3 | 265 |
| 4 | 1559 |
| 5 | 9101 |
| 6 | 53059 |
| 7 | 309265 |
| 8 | 1802543 |
| 9 | 10506005 |
| 10 | 61233499 |
| 11 | 356895001 |
| 12 | 2080136519 |
| 13 | 12123924125 |
| 14 | 70663408243 |
| 15 | 411856525345 |
| 16 | 2400475743839 |
| 17 | 13990997937701 |
| 18 | 81545511882379 |
| 19 | 475282073356585 |
| 20 | 2770146928257143 |
| 21 | 16145599496186285 |
| 22 | 94103450048860579 |
[-1,5,43,265,1559,9101,53059,309265,1802543, 10506005,61233499,356895001,2080136519, 12123924125,70663408243,411856525345, 2400475743839,13990997937701,81545511882379, 475282073356585,2770146928257143, 16145599496186285,94103450048860579] |