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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 19 |
| 7 | 43 |
| 8 | 91 |
| 9 | 201 |
| 10 | 422 |
| 11 | 918 |
| 12 | 1896 |
| 13 | 4089 |
| 14 | 8376 |
| 15 | 17793 |
| 16 | 36445 |
| 17 | 76446 |
| 18 | 155209 |
| 19 | 324481 |
| 20 | 655426 |
| 21 | 1355220 |
| 22 | 2741092 |
| 23 | 5617505 |
| 24 | 11291037 |
| 25 | 23086423 |
| 26 | 46227338 |
| 27 | 93753196 |
| 28 | 187754647 |
| 29 | 378675055 |
| 30 | 754695631 |
| 31 | 1518414812 |
| 32 | 3016719277 |
| 33 | 6037006608 |
| 34 | 11984729983 |
[1,1,2,4,9,19,43,91,201,422,918,1896,4089,8376, 17793,36445,76446,155209,324481,655426,1355220, 2741092,5617505,11291037,23086423,46227338, 93753196,187754647,378675055,754695631,1518414812, 3016719277,6037006608,11984729983] |