The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 10 |
| 4 | 18 |
| 5 | 1800 |
| 6 | 2079 |
| 7 | 6560 |
| 8 | 7688 |
| 9 | 11310 |
| 10 | 12437 |
| 11 | 24708 |
| 12 | 63577 |
[1,4,10,18,1800,2079,6560,7688,11310,12437,24708, 63577] |