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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 139 |
| 4 | 35692 |
| 5 | 111565148 |
| 6 | 5205269945088 |
| 7 | 4286767657466006784 |
| 8 | 71920030250887607243833344 |
| 9 | 27863293344390107424172413346185216 |
| 10 | 278632933465479015464665989671020186828800000 |
| 11 | 79497227734495207011816776516244120065118266248396800000 |
[0,1,5,139,35692,111565148,5205269945088, 4286767657466006784,71920030250887607243833344, 27863293344390107424172413346185216, 278632933465479015464665989671020186828800000, 79497227734495207011816776516244120065118266248396\ 800000] |