The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 12 |
| 3 | 464 |
| 4 | 38720 |
| 5 | 5678400 |
| 6 | 1294720000 |
| 7 | 423809075200 |
| 8 | 188422340198400 |
| 9 | 109244157102080000 |
| 10 | 80068011114291200000 |
| 11 | 72384558633074688000000 |
| 12 | 79125533869852634644480000 |
| 13 | 102879028406438808699535360000 |
| 14 | 156917389218035568246207283200000 |
| 15 | 277479100225377558605912342528000000 |
[1,12,464,38720,5678400,1294720000,423809075200, 188422340198400,109244157102080000, 80068011114291200000,72384558633074688000000, 79125533869852634644480000, 102879028406438808699535360000, 156917389218035568246207283200000, 277479100225377558605912342528000000] |