The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 56 |
| 4 | 7192 |
| 5 | 7232 |
| 6 | 7912 |
| 7 | 10792 |
| 8 | 17272 |
| 9 | 30592 |
| 10 | 114256 |
| 11 | 2154584 |
| 12 | 3428368 |
| 13 | 44375136 |
| 14 | 89245784 |
| 15 | 2739393699744 |
[1,4,56,7192,7232,7912,10792,17272,30592,114256, 2154584,3428368,44375136,89245784,2739393699744] |