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| n | a(n) |
|---|---|
| 13 | 2 |
| 14 | 10 |
| 15 | 53 |
| 16 | 220 |
| 17 | 845 |
| 18 | 2975 |
| 19 | 9936 |
| 20 | 31640 |
| 21 | 97283 |
| 22 | 290173 |
| 23 | 844729 |
| 24 | 2408213 |
| 25 | 6746197 |
| 26 | 18613290 |
| 27 | 50688554 |
| 28 | 136464665 |
| 29 | 363724034 |
| 30 | 960862781 |
| 31 | 2518380075 |
| 32 | 6554072749 |
| 33 | 16949040877 |
| 34 | 43580221577 |
| 35 | 111475092069 |
| 36 | 283799832989 |
[2,10,53,220,845,2975,9936,31640,97283,290173, 844729,2408213,6746197,18613290,50688554, 136464665,363724034,960862781,2518380075, 6554072749,16949040877,43580221577,111475092069, 283799832989] |