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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 5 |
| 5 | 21 |
| 6 | 14 |
| 7 | 84 |
| 8 | 42 |
| 9 | 330 |
| 10 | 132 |
| 11 | 1287 |
| 12 | 429 |
| 13 | 5005 |
| 14 | 1430 |
| 15 | 19448 |
| 16 | 4862 |
| 17 | 75582 |
| 18 | 16796 |
| 19 | 293930 |
| 20 | 58786 |
| 21 | 1144066 |
| 22 | 208012 |
| 23 | 4457400 |
| 24 | 742900 |
| 25 | 17383860 |
| 26 | 2674440 |
| 27 | 67863915 |
| 28 | 9694845 |
| 29 | 265182525 |
| 30 | 35357670 |
| 31 | 1037158320 |
| 32 | 129644790 |
| 33 | 4059928950 |
| 34 | 477638700 |
| 35 | 15905368710 |
[1,1,2,5,5,21,14,84,42,330,132,1287,429,5005,1430, 19448,4862,75582,16796,293930,58786,1144066, 208012,4457400,742900,17383860,2674440,67863915, 9694845,265182525,35357670,1037158320,129644790, 4059928950,477638700,15905368710] |