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| n | a(n) |
|---|---|
| 1 | 18 |
| 2 | 34 |
| 3 | 62 |
| 4 | 114 |
| 5 | 214 |
| 6 | 410 |
| 7 | 798 |
| 8 | 1570 |
| 9 | 3110 |
| 10 | 6186 |
| 11 | 12334 |
| 12 | 24626 |
| 13 | 49206 |
| 14 | 98362 |
| 15 | 196670 |
| 16 | 393282 |
| 17 | 786502 |
| 18 | 1572938 |
| 19 | 3145806 |
| 20 | 6291538 |
| 21 | 12582998 |
| 22 | 25165914 |
| 23 | 50331742 |
| 24 | 100663394 |
| 25 | 201326694 |
| 26 | 402653290 |
| 27 | 805306478 |
| 28 | 1610612850 |
| 29 | 3221225590 |
[18,34,62,114,214,410,798,1570,3110,6186,12334, 24626,49206,98362,196670,393282,786502,1572938, 3145806,6291538,12582998,25165914,50331742, 100663394,201326694,402653290,805306478, 1610612850,3221225590] |