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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 7 |
| 7 | 28 |
| 8 | 84 |
| 9 | 210 |
| 10 | 463 |
| 11 | 938 |
| 12 | 1821 |
| 13 | 3563 |
| 14 | 7385 |
| 15 | 16577 |
| 16 | 39529 |
| 17 | 96315 |
| 18 | 232393 |
| 19 | 546806 |
| 20 | 1251461 |
| 21 | 2801015 |
| 22 | 6189683 |
| 23 | 13647361 |
| 24 | 30281870 |
| 25 | 67918782 |
| 26 | 153939843 |
| 27 | 351309676 |
| 28 | 803438125 |
| 29 | 1834160110 |
| 30 | 4170751775 |
| 31 | 9443922772 |
| 32 | 21316094357 |
| 33 | 48041401423 |
| 34 | 108291578580 |
[1,0,0,0,0,1,7,28,84,210,463,938,1821,3563,7385, 16577,39529,96315,232393,546806,1251461,2801015, 6189683,13647361,30281870,67918782,153939843, 351309676,803438125,1834160110,4170751775, 9443922772,21316094357,48041401423,108291578580] |