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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 37 |
| 4 | 223 |
| 5 | 1297 |
| 6 | 7819 |
| 7 | 46657 |
| 8 | 280159 |
| 9 | 1679653 |
| 10 | 10078999 |
| 11 | 60466177 |
| 12 | 362805091 |
| 13 | 2176782337 |
| 14 | 13060740679 |
| 15 | 78364165429 |
| 16 | 470185264735 |
| 17 | 2821109907457 |
| 18 | 16926661132171 |
| 19 | 101559956668417 |
| 20 | 609359750089711 |
| 21 | 3656158440109669 |
| 22 | 21936950700844039 |
| 23 | 131621703842267137 |
[1,7,37,223,1297,7819,46657,280159,1679653, 10078999,60466177,362805091,2176782337, 13060740679,78364165429,470185264735, 2821109907457,16926661132171,101559956668417, 609359750089711,3656158440109669, 21936950700844039,131621703842267137] |