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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 72 |
| 4 | 288 |
| 5 | 86400 |
| 6 | 1036800 |
| 7 | 152409600 |
| 8 | 1219276800 |
| 9 | 438939648000 |
| 10 | 26336378880000 |
| 11 | 6373403688960000 |
| 12 | 229442532802560000 |
| 13 | 2714305163054284800000 |
| 14 | 228001633696559923200000 |
| 15 | 3420024505448398848000000 |
| 16 | 164161176261523144704000000 |
| 17 | 759081279033283021111296000000 |
[1,4,72,288,86400,1036800,152409600,1219276800, 438939648000,26336378880000,6373403688960000, 229442532802560000,2714305163054284800000, 228001633696559923200000, 3420024505448398848000000, 164161176261523144704000000, 759081279033283021111296000000] |