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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 5 |
| 2 | 11 |
| 3 | 29 |
| 4 | 83 |
| 5 | 271 |
| 6 | 733 |
| 7 | 2203 |
| 8 | 6563 |
| 9 | 19687 |
| 10 | 59051 |
| 11 | 177217 |
| 12 | 531457 |
| 13 | 1594339 |
| 14 | 4782971 |
| 15 | 14348909 |
| 16 | 43046749 |
| 17 | 129140251 |
| 18 | 387420499 |
| 19 | 1162261603 |
| 20 | 3486784447 |
| 21 | 10460353369 |
| 22 | 31381059613 |
| 23 | 94143178933 |
| 24 | 282429536483 |
| 25 | 847288609471 |
| 26 | 2541865828331 |
| 27 | 7625597485003 |
| 28 | 22876792455031 |
[2,5,11,29,83,271,733,2203,6563,19687,59051, 177217,531457,1594339,4782971,14348909,43046749, 129140251,387420499,1162261603,3486784447, 10460353369,31381059613,94143178933,282429536483, 847288609471,2541865828331,7625597485003, 22876792455031] |