The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 2 | 3 |
| 3 | 15 |
| 4 | 35 |
| 5 | 315 |
| 6 | 693 |
| 7 | 1001 |
| 8 | 6435 |
| 9 | 109395 |
| 10 | 230945 |
| 11 | 969969 |
| 12 | 2028117 |
| 13 | 16900975 |
| 14 | 35102025 |
| 15 | 145422675 |
| 16 | 20036013 |
| 17 | 9917826435 |
| 18 | 20419054425 |
| 19 | 27981667175 |
| 20 | 172308161025 |
| 21 | 282585384081 |
| 22 | 964378691705 |
| 23 | 11835556670925 |
| 24 | 24185702762325 |
[3,15,35,315,693,1001,6435,109395,230945,969969, 2028117,16900975,35102025,145422675,20036013, 9917826435,20419054425,27981667175,172308161025, 282585384081,964378691705,11835556670925, 24185702762325] |