The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 0 |
| 2 | 14 |
| 3 | 45 |
| 4 | 198 |
| 5 | 5114 |
| 6 | 65174 |
| 7 | 1086194 |
| 8 | 20485574 |
| 9 | 465779078 |
| 10 | 0 |
| 11 | 293420849770 |
| 12 | 318745032938881 |
[2,0,14,45,198,5114,65174,1086194,20485574, 465779078,0,293420849770,318745032938881] |