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| n | a(n) |
|---|---|
| 10 | 1 |
| 11 | 0 |
| 12 | 10 |
| 13 | 12 |
| 14 | 55 |
| 15 | 144 |
| 16 | 311 |
| 17 | 936 |
| 18 | 1989 |
| 19 | 4928 |
| 20 | 11557 |
| 21 | 25340 |
| 22 | 59025 |
| 23 | 128576 |
| 24 | 283100 |
| 25 | 620976 |
| 26 | 1327258 |
| 27 | 2862528 |
| 28 | 6080645 |
| 29 | 12845064 |
| 30 | 27102284 |
| 31 | 56625624 |
| 32 | 118144679 |
| 33 | 245331648 |
| 34 | 507035957 |
| 35 | 1045854240 |
| 36 | 2148159266 |
| 37 | 4400962876 |
| 38 | 8993987459 |
| 39 | 18326508928 |
| 40 | 37269909849 |
[1,0,10,12,55,144,311,936,1989,4928,11557,25340, 59025,128576,283100,620976,1327258,2862528, 6080645,12845064,27102284,56625624,118144679, 245331648,507035957,1045854240,2148159266, 4400962876,8993987459,18326508928,37269909849] |