The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 32 |
| 3 | 544 |
| 4 | 17536 |
| 5 | 997504 |
| 6 | 91956224 |
| 7 | 12588279552 |
| 8 | 2388796493824 |
| 9 | 598131709419520 |
| 10 | 190679121272193024 |
| 11 | 75328224099389177856 |
| 12 | 36099809995192945868800 |
| 13 | 20626251224635998952554496 |
[1,4,32,544,17536,997504,91956224,12588279552, 2388796493824,598131709419520,190679121272193024, 75328224099389177856,36099809995192945868800, 20626251224635998952554496] |