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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 12 |
| 4 | 26 |
| 5 | 44 |
| 6 | 86 |
| 7 | 136 |
| 8 | 239 |
| 9 | 376 |
| 10 | 613 |
| 11 | 930 |
| 12 | 1485 |
| 13 | 2194 |
| 14 | 3355 |
| 15 | 4948 |
| 16 | 7372 |
| 17 | 10656 |
| 18 | 15660 |
| 19 | 22359 |
| 20 | 32308 |
[2,6,12,26,44,86,136,239,376,613,930,1485,2194, 3355,4948,7372,10656,15660,22359,32308] |