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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 11 |
| 5 | 21 |
| 6 | 48 |
| 7 | 92 |
| 8 | 199 |
| 9 | 406 |
| 10 | 824 |
| 11 | 1737 |
| 12 | 3496 |
| 13 | 7312 |
| 14 | 14959 |
| 15 | 30787 |
| 16 | 63693 |
| 17 | 130387 |
| 18 | 269786 |
| 19 | 553986 |
| 20 | 1141638 |
| 21 | 2352405 |
| 22 | 4837537 |
| 23 | 9974721 |
| 24 | 20519951 |
| 25 | 42273108 |
| 26 | 87046496 |
| 27 | 179198379 |
| 28 | 369124998 |
| 29 | 759870636 |
| 30 | 1564982079 |
| 31 | 3222379032 |
[1,1,2,5,11,21,48,92,199,406,824,1737,3496,7312, 14959,30787,63693,130387,269786,553986,1141638, 2352405,4837537,9974721,20519951,42273108, 87046496,179198379,369124998,759870636,1564982079, 3222379032] |