The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 10660 |
| 2 | 65310 |
| 3 | 279161 |
| 4 | 993123 |
| 5 | 3183434 |
| 6 | 9580060 |
| 7 | 27710543 |
| 8 | 78195145 |
| 9 | 217483704 |
| 10 | 600720730 |
| 11 | 1657359573 |
| 12 | 4587075263 |
| 13 | 12774934710 |
| 14 | 35868804392 |
| 15 | 101626338475 |
| 16 | 290581221893 |
| 17 | 838071567940 |
| 18 | 2435917896966 |
| 19 | 7127659997521 |
| 20 | 20972608975899 |
[10660,65310,279161,993123,3183434,9580060, 27710543,78195145,217483704,600720730,1657359573, 4587075263,12774934710,35868804392,101626338475, 290581221893,838071567940,2435917896966, 7127659997521,20972608975899] |