The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 42 |
| 6 | 132 |
| 7 | 429 |
| 8 | 1430 |
| 9 | 4862 |
| 10 | 16795 |
| 11 | 1 |
| 12 | 58783 |
| 13 | 3 |
| 14 | 208002 |
| 15 | 10 |
| 16 | 742865 |
| 17 | 35 |
| 18 | 2674314 |
| 19 | 126 |
| 20 | 9694383 |
| 21 | 462 |
| 22 | 35355954 |
| 23 | 1716 |
| 24 | 129638355 |
| 25 | 6435 |
| 26 | 477614391 |
| 27 | 24308 |
| 28 | 1 |
| 29 | 1767170815 |
| 30 | 92372 |
| 31 | 3 |
| 32 | 6563767715 |
| 33 | 352694 |
| 34 | 11 |
| 35 | 24464914983 |
| 36 | 1351996 |
| 37 | 41 |
| 38 | 91477363496 |
| 39 | 5199988 |
[1,1,2,5,14,42,132,429,1430,4862,16795,1,58783,3, 208002,10,742865,35,2674314,126,9694383,462, 35355954,1716,129638355,6435,477614391,24308,1, 1767170815,92372,3,6563767715,352694,11, 24464914983,1351996,41,91477363496,5199988] |