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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 73 |
| 4 | 1952 |
| 5 | 208559 |
| 6 | 34974844 |
| 7 | 12713143876 |
| 8 | 10031326473244 |
| 9 | 16844842566734425 |
| 10 | 61957626701788646084 |
| 11 | 497581272671041376917187 |
[0,0,73,1952,208559,34974844,12713143876, 10031326473244,16844842566734425, 61957626701788646084,497581272671041376917187] |