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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 91 |
| 4 | 5106 |
| 5 | 510312 |
| 6 | 79419180 |
| 7 | 17758541160 |
| 8 | 5397245416080 |
| 9 | 2140495978440960 |
| 10 | 1073686615987184640 |
| 11 | 664582969579048732800 |
| 12 | 497566995304189676342400 |
| 13 | 443212653988584642449548800 |
| 14 | 463237380681508395323231270400 |
| 15 | 561422444732790213860755013145600 |
| 16 | 780983354978825959061219179885824000 |
[1,4,91,5106,510312,79419180,17758541160, 5397245416080,2140495978440960, 1073686615987184640,664582969579048732800, 497566995304189676342400, 443212653988584642449548800, 463237380681508395323231270400, 561422444732790213860755013145600, 780983354978825959061219179885824000] |