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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 6 |
| 7 | 10 |
| 8 | 23 |
| 9 | 48 |
| 10 | 99 |
| 11 | 194 |
| 12 | 392 |
| 13 | 791 |
| 14 | 1600 |
| 15 | 3290 |
| 16 | 6810 |
| 17 | 13900 |
| 18 | 28269 |
| 19 | 57455 |
| 20 | 116213 |
| 21 | 234237 |
| 22 | 470861 |
| 23 | 945510 |
| 24 | 1897007 |
| 25 | 3802257 |
| 26 | 7616206 |
| 27 | 15244011 |
| 28 | 30493702 |
| 29 | 60965480 |
| 30 | 121838430 |
| 31 | 243409121 |
| 32 | 486131077 |
| 33 | 970680425 |
| 34 | 1937876841 |
| 35 | 3868346975 |
[0,0,0,1,2,6,10,23,48,99,194,392,791,1600,3290, 6810,13900,28269,57455,116213,234237,470861, 945510,1897007,3802257,7616206,15244011,30493702, 60965480,121838430,243409121,486131077,970680425, 1937876841,3868346975] |