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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 10 |
| 7 | 196 |
| 8 | 2477 |
| 9 | 25886 |
| 10 | 244233 |
| 11 | 2167834 |
| 12 | 18510734 |
| 13 | 154082218 |
| 14 | 1260811144 |
| 15 | 10198142484 |
| 16 | 81848366557 |
| 17 | 653537296202 |
| 18 | 5201485318177 |
| 19 | 41321901094750 |
| 20 | 327996498249202 |
[0,0,0,0,0,10,196,2477,25886,244233,2167834, 18510734,154082218,1260811144,10198142484, 81848366557,653537296202,5201485318177, 41321901094750,327996498249202] |