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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 3 |
| 3 | 1 |
| 4 | 9 |
| 5 | 6 |
| 6 | 28 |
| 7 | 27 |
| 8 | 90 |
| 9 | 109 |
| 10 | 297 |
| 11 | 417 |
| 12 | 1000 |
| 13 | 1548 |
| 14 | 3417 |
| 15 | 5644 |
| 16 | 11799 |
| 17 | 20349 |
| 18 | 41041 |
| 19 | 72846 |
| 20 | 143472 |
| 21 | 259579 |
| 22 | 503262 |
| 23 | 922209 |
| 24 | 1769365 |
| 25 | 3269889 |
| 26 | 6230304 |
| 27 | 11579032 |
| 28 | 21960801 |
| 29 | 40967400 |
| 30 | 77461435 |
| 31 | 144863001 |
| 32 | 273351705 |
| 33 | 512050438 |
| 34 | 964918116 |
| 35 | 1809503019 |
[1,0,3,1,9,6,28,27,90,109,297,417,1000,1548,3417, 5644,11799,20349,41041,72846,143472,259579,503262, 922209,1769365,3269889,6230304,11579032,21960801, 40967400,77461435,144863001,273351705,512050438, 964918116,1809503019] |