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| n | a(n) |
|---|---|
| 0 | 7 |
| 1 | 35 |
| 2 | 162 |
| 3 | 721 |
| 4 | 3139 |
| 5 | 13504 |
| 6 | 57707 |
| 7 | 245671 |
| 8 | 1043634 |
| 9 | 4428053 |
| 10 | 18774815 |
| 11 | 79573152 |
| 12 | 337178159 |
| 13 | 1428553243 |
| 14 | 6052037010 |
| 15 | 25638260873 |
| 16 | 108608846171 |
| 17 | 460082737472 |
| 18 | 1948961747155 |
| 19 | 8255982722783 |
| 20 | 34973020586946 |
| 21 | 148148373971341 |
| 22 | 627567262233463 |
| 23 | 2658419223345984 |
[7,35,162,721,3139,13504,57707,245671,1043634, 4428053,18774815,79573152,337178159,1428553243, 6052037010,25638260873,108608846171,460082737472, 1948961747155,8255982722783,34973020586946, 148148373971341,627567262233463,2658419223345984] |