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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 4 |
| 3 | 8 |
| 4 | 15 |
| 5 | 28 |
| 6 | 54 |
| 7 | 101 |
| 8 | 199 |
| 9 | 373 |
| 10 | 743 |
| 11 | 1404 |
| 12 | 2801 |
| 13 | 5353 |
| 14 | 10636 |
| 15 | 20495 |
| 16 | 40615 |
| 17 | 78753 |
| 18 | 155793 |
| 19 | 303553 |
| 20 | 599801 |
| 21 | 1173183 |
| 22 | 2316317 |
| 23 | 4544731 |
| 24 | 8968421 |
| 25 | 17641499 |
| 26 | 34801731 |
| 27 | 68602923 |
| 28 | 135308317 |
| 29 | 267203186 |
| 30 | 526966454 |
| 31 | 1042217402 |
[1,3,4,8,15,28,54,101,199,373,743,1404,2801,5353, 10636,20495,40615,78753,155793,303553,599801, 1173183,2316317,4544731,8968421,17641499,34801731, 68602923,135308317,267203186,526966454,1042217402] |