The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 3 |
| 5 | 15 |
| 6 | 15 |
| 7 | 105 |
| 8 | 105 |
| 9 | 105 |
| 10 | 105 |
| 11 | 1155 |
| 12 | 1155 |
| 13 | 15015 |
| 14 | 15015 |
| 15 | 15015 |
| 16 | 15015 |
| 17 | 255255 |
| 18 | 255255 |
| 19 | 4849845 |
| 20 | 4849845 |
| 21 | 4849845 |
| 22 | 4849845 |
| 23 | 111546435 |
| 24 | 111546435 |
| 25 | 111546435 |
| 26 | 111546435 |
| 27 | 111546435 |
| 28 | 111546435 |
| 29 | 3234846615 |
| 30 | 3234846615 |
| 31 | 100280245065 |
| 32 | 100280245065 |
[1,1,2,6,3,15,15,105,105,105,105,1155,1155,15015, 15015,15015,15015,255255,255255,4849845,4849845, 4849845,4849845,111546435,111546435,111546435, 111546435,111546435,111546435,3234846615, 3234846615,100280245065,100280245065] |