The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 4 |
| 2 | 106 |
| 3 | 2384 |
| 4 | 51196 |
| 5 | 958170 |
| 6 | 24341911 |
| 7 | 636875169 |
| 8 | 14536767750 |
| 9 | 285039411789 |
| 10 | 6322647312660 |
| 11 | 202105291334913 |
[0,4,106,2384,51196,958170,24341911,636875169, 14536767750,285039411789,6322647312660, 202105291334913] |