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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 28 |
| 3 | 102 |
| 4 | 416 |
| 5 | 2313 |
| 6 | 10682 |
| 7 | 49746 |
| 8 | 244887 |
| 9 | 1177228 |
| 10 | 5627176 |
| 11 | 27191679 |
| 12 | 131066702 |
| 13 | 630509899 |
| 14 | 3039081334 |
| 15 | 14646383331 |
| 16 | 70553902114 |
| 17 | 339981134313 |
| 18 | 1638328386371 |
| 19 | 7894211192665 |
| 20 | 38039938958253 |
| 21 | 183306173610271 |
| 22 | 883299222702849 |
[8,28,102,416,2313,10682,49746,244887,1177228, 5627176,27191679,131066702,630509899,3039081334, 14646383331,70553902114,339981134313, 1638328386371,7894211192665,38039938958253, 183306173610271,883299222702849] |