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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 16 |
| 3 | 3456 |
| 4 | 12931216 |
| 5 | 655816458528 |
| 6 | 473216230511351044 |
| 7 | 4822507485300347026181088 |
| 8 | 695298786420085228281048744405924 |
| 9 | 1417923660297801516897331705897083237291008 |
[0,16,3456,12931216,655816458528, 473216230511351044,4822507485300347026181088, 695298786420085228281048744405924, 1417923660297801516897331705897083237291008] |