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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 7 |
| 6 | 17 |
| 7 | 40 |
| 8 | 90 |
| 9 | 199 |
| 10 | 435 |
| 11 | 939 |
| 12 | 2007 |
| 13 | 4258 |
| 14 | 8976 |
| 15 | 18817 |
| 16 | 39263 |
| 17 | 81595 |
| 18 | 168969 |
| 19 | 348820 |
| 20 | 718134 |
| 21 | 1474863 |
| 22 | 3022407 |
| 23 | 6181687 |
| 24 | 12621135 |
| 25 | 25727686 |
| 26 | 52369508 |
| 27 | 106460521 |
| 28 | 216162987 |
| 29 | 438431215 |
| 30 | 888359841 |
| 31 | 1798371648 |
| 32 | 3637518354 |
| 33 | 7351824439 |
| 34 | 14848255803 |
[0,0,0,1,3,7,17,40,90,199,435,939,2007,4258,8976, 18817,39263,81595,168969,348820,718134,1474863, 3022407,6181687,12621135,25727686,52369508, 106460521,216162987,438431215,888359841, 1798371648,3637518354,7351824439,14848255803] |