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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 63063000 |
| 5 | 149144498504001000 |
| 6 | 2834492178580299130305958000 |
| 7 | 337799058758556439723480176591336120000 |
| 8 | 203269774721184658406475682049947158681837795504000 |
[0,0,1,63063000,149144498504001000, 2834492178580299130305958000, 337799058758556439723480176591336120000, 20326977472118465840647568204994715868183779550400\ 0] |