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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 10 |
| 3 | 17 |
| 4 | 20 |
| 5 | 37 |
| 6 | 142 |
| 7 | 295 |
| 8 | 467 |
| 9 | 1217 |
| 10 | 3160 |
| 11 | 5781 |
| 12 | 12289 |
| 13 | 31456 |
| 14 | 67234 |
| 15 | 135899 |
| 16 | 318669 |
| 17 | 727470 |
| 18 | 1526118 |
| 19 | 3363597 |
| 20 | 7702579 |
| 21 | 16806258 |
| 22 | 36429770 |
| 23 | 81802071 |
| 24 | 181935110 |
| 25 | 396718472 |
| 26 | 877432782 |
| 27 | 1955831475 |
| 28 | 4304980042 |
| 29 | 9473398215 |
[2,10,17,20,37,142,295,467,1217,3160,5781,12289, 31456,67234,135899,318669,727470,1526118,3363597, 7702579,16806258,36429770,81802071,181935110, 396718472,877432782,1955831475,4304980042, 9473398215] |