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| n | a(n) |
|---|---|
| 2 | 4 |
| 3 | 24 |
| 4 | 304 |
| 5 | 5440 |
| 6 | 125824 |
| 7 | 3566080 |
| 8 | 119614464 |
| 9 | 4633387008 |
| 10 | 203524112384 |
| 11 | 9995546722304 |
| 12 | 542730361241600 |
| 13 | 32281981804347392 |
| 14 | 2087454641985945600 |
| 15 | 145797871819529650176 |
| 16 | 10938609224992417644544 |
| 17 | 877346430770422497673216 |
[4,24,304,5440,125824,3566080,119614464, 4633387008,203524112384,9995546722304, 542730361241600,32281981804347392, 2087454641985945600,145797871819529650176, 10938609224992417644544,877346430770422497673216] |