The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 3 | 4 |
| 4 | 24 |
| 5 | 144 |
| 6 | 760 |
| 7 | 4512 |
| 8 | 26220 |
| 9 | 163020 |
| 10 | 1032484 |
| 11 | 6782244 |
| 12 | 45419980 |
| 13 | 311775420 |
| 14 | 2174371512 |
| 15 | 15421367820 |
| 16 | 110807959560 |
| 17 | 806060157124 |
| 18 | 5924773164244 |
| 19 | 43967355888600 |
| 20 | 329024223763512 |
| 21 | 2481154828428784 |
| 22 | 18839416123775160 |
| 23 | 143951380037336340 |
| 24 | 1106253702164150544 |
| 25 | 8546422021727402760 |
| 26 | 66346825443130687180 |
[4,24,144,760,4512,26220,163020,1032484,6782244, 45419980,311775420,2174371512,15421367820, 110807959560,806060157124,5924773164244, 43967355888600,329024223763512,2481154828428784, 18839416123775160,143951380037336340, 1106253702164150544,8546422021727402760, 66346825443130687180] |