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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 144 |
| 3 | 288 |
| 4 | 86400 |
| 5 | 129600 |
| 6 | 194400 |
| 7 | 259200 |
| 8 | 518400 |
| 9 | 190512000 |
| 10 | 317520000 |
| 11 | 381024000 |
| 12 | 635040000 |
| 13 | 9681819840000 |
| 14 | 215982036990720000 |
| 15 | 9466852651364908800000 |
| 16 | 14200278977047363200000 |
| 17 | 28400557954094726400000 |
| 18 | 174294224164279335916800000 |
| 19 | 522882672492838007750400000 |
[4,144,288,86400,129600,194400,259200,518400, 190512000,317520000,381024000,635040000, 9681819840000,215982036990720000, 9466852651364908800000,14200278977047363200000, 28400557954094726400000, 174294224164279335916800000, 522882672492838007750400000] |