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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 6 |
| 7 | 34 |
| 8 | 181 |
| 9 | 871 |
| 10 | 4016 |
| 11 | 18526 |
| 12 | 85101 |
| 13 | 393148 |
| 14 | 1822977 |
| 15 | 8500893 |
| 16 | 39809180 |
| 17 | 187230704 |
| 18 | 883730048 |
| 19 | 4184926222 |
| 20 | 19874478310 |
| 21 | 94629276256 |
| 22 | 451604739323 |
| 23 | 2159748985582 |
| 24 | 10348493650194 |
| 25 | 49671898709098 |
| 26 | 238804606717950 |
| 27 | 1149792470325340 |
| 28 | 5543620159707666 |
| 29 | 26762240285558924 |
| 30 | 129350640352555296 |
| 31 | 625889650880647630 |
| 32 | 3031651402693863747 |
| 33 | 14698911258326292182 |
| 34 | 71332938143655936584 |
| 35 | 346474231506471943759 |
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