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| n | a(n) |
|---|---|
| 7 | 0 |
| 8 | 0 |
| 9 | 2 |
| 10 | 3 |
| 11 | 12 |
| 12 | 23 |
| 13 | 61 |
| 14 | 135 |
| 15 | 306 |
| 16 | 679 |
| 17 | 1496 |
| 18 | 3245 |
| 19 | 7013 |
| 20 | 15045 |
| 21 | 32108 |
| 22 | 68201 |
| 23 | 144297 |
| 24 | 304227 |
| 25 | 639461 |
| 26 | 1340353 |
| 27 | 2802566 |
| 28 | 5846953 |
| 29 | 12173864 |
| 30 | 25300472 |
| 31 | 52492698 |
| 32 | 108742226 |
| 33 | 224946169 |
| 34 | 464714125 |
| 35 | 958872587 |
| 36 | 1976242406 |
| 37 | 4068708686 |
| 38 | 8368344952 |
| 39 | 17195541858 |
[0,0,2,3,12,23,61,135,306,679,1496,3245,7013, 15045,32108,68201,144297,304227,639461,1340353, 2802566,5846953,12173864,25300472,52492698, 108742226,224946169,464714125,958872587, 1976242406,4068708686,8368344952,17195541858] |