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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 13 |
| 4 | 34 |
| 5 | 89 |
| 6 | 234 |
| 7 | 615 |
| 8 | 1616 |
| 9 | 4246 |
| 10 | 11156 |
| 11 | 29314 |
| 12 | 77026 |
| 13 | 202394 |
| 14 | 531811 |
| 15 | 1397387 |
| 16 | 3671781 |
| 17 | 9647988 |
| 18 | 25351094 |
| 19 | 66612640 |
| 20 | 175031647 |
| 21 | 459913889 |
| 22 | 1208471657 |
| 23 | 3175385173 |
| 24 | 8343655339 |
| 25 | 21923823599 |
| 26 | 57607130438 |
| 27 | 151368736483 |
| 28 | 397737124030 |
| 29 | 1045095727865 |
[1,2,5,13,34,89,234,615,1616,4246,11156,29314, 77026,202394,531811,1397387,3671781,9647988, 25351094,66612640,175031647,459913889,1208471657, 3175385173,8343655339,21923823599,57607130438, 151368736483,397737124030,1045095727865] |