The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 2 |
| 5 | 5 |
| 6 | 5 |
| 7 | 14 |
| 8 | 14 |
| 9 | 42 |
| 10 | 42 |
| 11 | 132 |
| 12 | 132 |
| 13 | 429 |
| 14 | 429 |
| 15 | 1430 |
| 16 | 1430 |
| 17 | 4862 |
| 18 | 4862 |
| 19 | 16796 |
| 20 | 16796 |
| 21 | 58786 |
| 22 | 58786 |
| 23 | 208012 |
| 24 | 208012 |
| 25 | 742900 |
| 26 | 742900 |
| 27 | 2674440 |
| 28 | 2674440 |
| 29 | 9694845 |
| 30 | 9694845 |
| 31 | 35357670 |
| 32 | 35357670 |
| 33 | 129644790 |
| 34 | 129644790 |
| 35 | 477638700 |
| 36 | 477638700 |
| 37 | 1767263190 |
[1,1,1,2,2,5,5,14,14,42,42,132,132,429,429,1430, 1430,4862,4862,16796,16796,58786,58786,208012, 208012,742900,742900,2674440,2674440,9694845, 9694845,35357670,35357670,129644790,129644790, 477638700,477638700,1767263190] |