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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 13 |
| 4 | 29 |
| 5 | 60 |
| 6 | 122 |
| 7 | 241 |
| 8 | 468 |
| 9 | 894 |
| 10 | 1686 |
| 11 | 3144 |
| 12 | 5807 |
| 13 | 10636 |
| 14 | 19338 |
| 15 | 34931 |
| 16 | 62731 |
| 17 | 112068 |
| 18 | 199264 |
| 19 | 352787 |
| 20 | 622152 |
| 21 | 1093260 |
| 22 | 1914780 |
| 23 | 3343440 |
| 24 | 5821645 |
| 25 | 10110278 |
| 26 | 17515566 |
| 27 | 30276073 |
| 28 | 52221929 |
| 29 | 89896332 |
| 30 | 154461110 |
| 31 | 264930661 |
| 32 | 453654108 |
| 33 | 775598634 |
| 34 | 1324053522 |
[1,2,6,13,29,60,122,241,468,894,1686,3144,5807, 10636,19338,34931,62731,112068,199264,352787, 622152,1093260,1914780,3343440,5821645,10110278, 17515566,30276073,52221929,89896332,154461110, 264930661,453654108,775598634,1324053522] |