The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 16 |
| 3 | 211 |
| 4 | 4914 |
| 5 | 181626 |
| 6 | 11895711 |
| 7 | 1318303126 |
| 8 | 260970703443 |
| 9 | 90649351648443 |
| 10 | 56467754515732171 |
| 11 | 62670898425586313650 |
| 12 | 124996110915469809369126 |
[2,16,211,4914,181626,11895711,1318303126, 260970703443,90649351648443,56467754515732171, 62670898425586313650,124996110915469809369126] |