The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 27 |
| 4 | 336 |
| 5 | 7485 |
| 6 | 302028 |
| 7 | 22527767 |
| 8 | 3174112032 |
| 9 | 860830383001 |
| 10 | 455774790482644 |
| 11 | 475669638563475699 |
| 12 | 984532608418927789552 |
| 13 | 4056144440301146818242325 |
| 14 | 33333077239591357063936218268 |
| 15 | 547060937677964735150346948379055 |
| 16 | 17942490183726140248811670424624773696 |
[1,1,4,27,336,7485,302028,22527767,3174112032, 860830383001,455774790482644,475669638563475699, 984532608418927789552,4056144440301146818242325, 33333077239591357063936218268, 547060937677964735150346948379055, 17942490183726140248811670424624773696] |