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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 91 |
| 4 | 2910 |
| 5 | 187178 |
| 6 | 24019884 |
| 7 | 6154080275 |
| 8 | 3151538898870 |
| 9 | 3227331249742334 |
| 10 | 6609648919647088788 |
| 11 | 27073195436180090799006 |
| 12 | 221783764770326660974008300 |
| 13 | 3633705802215756626623500731892 |
| 14 | 119069276624759801067298501607804376 |
[1,1,6,91,2910,187178,24019884,6154080275, 3151538898870,3227331249742334, 6609648919647088788,27073195436180090799006, 221783764770326660974008300, 3633705802215756626623500731892, 119069276624759801067298501607804376] |