The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 3 |
| 3 | 11 |
| 4 | 95 |
| 5 | 1414 |
| 6 | 31619 |
| 7 | 980328 |
| 8 | 39966975 |
| 9 | 2063473712 |
| 10 | 131165658459 |
| 11 | 10041515879680 |
| 12 | 909567637557215 |
| 13 | 96070344004816128 |
| 14 | 11688399779985830355 |
| 15 | 1621144844290431509504 |
| 16 | 254042974238965752088575 |
[0,3,11,95,1414,31619,980328,39966975,2063473712, 131165658459,10041515879680,909567637557215, 96070344004816128,11688399779985830355, 1621144844290431509504,254042974238965752088575] |