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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 35 |
| 3 | 156 |
| 4 | 786 |
| 5 | 3761 |
| 6 | 18725 |
| 7 | 92578 |
| 8 | 463045 |
| 9 | 2308299 |
| 10 | 11536977 |
| 11 | 57665448 |
| 12 | 288255915 |
| 13 | 1441171251 |
| 14 | 7205071761 |
| 15 | 36023566370 |
| 16 | 180108084412 |
| 17 | 900499990791 |
| 18 | 4502306264686 |
| 19 | 22510579308742 |
| 20 | 112548275061883 |
| 21 | 562718206201266 |
[8,35,156,786,3761,18725,92578,463045,2308299, 11536977,57665448,288255915,1441171251,7205071761, 36023566370,180108084412,900499990791, 4502306264686,22510579308742,112548275061883, 562718206201266] |