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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 5 |
| 2 | 37 |
| 3 | 215 |
| 4 | 1297 |
| 5 | 7775 |
| 6 | 46657 |
| 7 | 279935 |
| 8 | 1679617 |
| 9 | 10077695 |
| 10 | 60466177 |
| 11 | 362797055 |
| 12 | 2176782337 |
| 13 | 13060694015 |
| 14 | 78364164097 |
| 15 | 470184984575 |
| 16 | 2821109907457 |
| 17 | 16926659444735 |
| 18 | 101559956668417 |
| 19 | 609359740010495 |
| 20 | 3656158440062977 |
| 21 | 21936950640377855 |
| 22 | 131621703842267137 |
[2,5,37,215,1297,7775,46657,279935,1679617, 10077695,60466177,362797055,2176782337, 13060694015,78364164097,470184984575, 2821109907457,16926659444735,101559956668417, 609359740010495,3656158440062977, 21936950640377855,131621703842267137] |