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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 65 |
| 3 | 261 |
| 4 | 1137 |
| 5 | 4979 |
| 6 | 22089 |
| 7 | 98560 |
| 8 | 441950 |
| 9 | 1985853 |
| 10 | 8936025 |
| 11 | 40245259 |
| 12 | 181349063 |
| 13 | 817441187 |
| 14 | 3685379513 |
| 15 | 16617254516 |
| 16 | 74932039580 |
| 17 | 337905147089 |
| 18 | 1523819827721 |
| 19 | 6871941730432 |
| 20 | 30990572266213 |
| 21 | 139759818308246 |
[8,65,261,1137,4979,22089,98560,441950,1985853, 8936025,40245259,181349063,817441187,3685379513, 16617254516,74932039580,337905147089, 1523819827721,6871941730432,30990572266213, 139759818308246] |