The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 560 |
| 2 | 960 |
| 3 | 2992 |
| 4 | 5280 |
| 5 | 13800 |
| 6 | 27072 |
| 7 | 63496 |
| 8 | 130464 |
| 9 | 297288 |
| 10 | 612480 |
| 11 | 1410760 |
| 12 | 2875104 |
| 13 | 6716232 |
| 14 | 13589568 |
| 15 | 31922056 |
| 16 | 64500000 |
| 17 | 151450440 |
| 18 | 306332928 |
| 19 | 718070344 |
| 20 | 1453854816 |
| 21 | 3404870472 |
| 22 | 6895922880 |
| 23 | 16148448520 |
| 24 | 32703297696 |
[560,960,2992,5280,13800,27072,63496,130464, 297288,612480,1410760,2875104,6716232,13589568, 31922056,64500000,151450440,306332928,718070344, 1453854816,3404870472,6895922880,16148448520, 32703297696] |