The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 20 |
| 3 | 412 |
| 4 | 712 |
| 5 | 2092 |
| 6 | 4704 |
| 7 | 10176 |
| 8 | 33396 |
| 9 | 41124 |
| 10 | 105604 |
| 11 | 139780 |
| 12 | 142924 |
[12,20,412,712,2092,4704,10176,33396,41124,105604, 139780,142924] |