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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 32 |
| 4 | 512 |
| 5 | 12000 |
| 6 | 366400 |
| 7 | 13688960 |
| 8 | 602193152 |
| 9 | 30397531136 |
| 10 | 1728411805184 |
| 11 | 109177081065472 |
| 12 | 7578667350118400 |
| 13 | 573143826340921344 |
| 14 | 46886796648225349632 |
| 15 | 4124437046595970498560 |
| 16 | 388153835886455237115904 |
| 17 | 38910750374376922179960832 |
| 18 | 4139100381105952654252048384 |
| 19 | 465644313330130076144183017472 |
[1,2,4,32,512,12000,366400,13688960,602193152, 30397531136,1728411805184,109177081065472, 7578667350118400,573143826340921344, 46886796648225349632,4124437046595970498560, 388153835886455237115904, 38910750374376922179960832, 4139100381105952654252048384, 465644313330130076144183017472] |