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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 36 |
| 4 | 288 |
| 5 | 7200 |
| 6 | 43200 |
| 7 | 2116800 |
| 8 | 33868800 |
| 9 | 914457600 |
| 10 | 9144576000 |
| 11 | 1106493696000 |
| 12 | 13277924352000 |
| 13 | 2243969215488000 |
| 14 | 31415569016832000 |
| 15 | 471233535252480000 |
| 16 | 15079473128079360000 |
| 17 | 4357967734014935040000 |
| 18 | 78443419212268830720000 |
[1,1,4,36,288,7200,43200,2116800,33868800, 914457600,9144576000,1106493696000,13277924352000, 2243969215488000,31415569016832000, 471233535252480000,15079473128079360000, 4357967734014935040000,78443419212268830720000] |