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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 12 |
| 4 | 36 |
| 5 | 107 |
| 6 | 321 |
| 7 | 957 |
| 8 | 2868 |
| 9 | 8581 |
| 10 | 25694 |
| 11 | 76914 |
| 12 | 230273 |
| 13 | 689377 |
| 14 | 2063867 |
| 15 | 6178778 |
| 16 | 18498023 |
| 17 | 55379290 |
| 18 | 165794354 |
| 19 | 496354537 |
| 20 | 1485984549 |
| 21 | 4448735449 |
| 22 | 13318609060 |
| 23 | 39873206463 |
| 24 | 119372269782 |
| 25 | 357376295102 |
| 26 | 1069911935955 |
[2,5,12,36,107,321,957,2868,8581,25694,76914, 230273,689377,2063867,6178778,18498023,55379290, 165794354,496354537,1485984549,4448735449, 13318609060,39873206463,119372269782,357376295102, 1069911935955] |