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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 16 |
| 3 | 160 |
| 4 | 1600 |
| 5 | 15840 |
| 6 | 156816 |
| 7 | 1552320 |
| 8 | 15366400 |
| 9 | 152111680 |
| 10 | 1505750416 |
| 11 | 14905392480 |
| 12 | 147548174400 |
| 13 | 1460576351520 |
| 14 | 14458215340816 |
| 15 | 143121577056640 |
| 16 | 1416757555225600 |
| 17 | 14024453975199360 |
| 18 | 138827782196768016 |
[0,16,160,1600,15840,156816,1552320,15366400, 152111680,1505750416,14905392480,147548174400, 1460576351520,14458215340816,143121577056640, 1416757555225600,14024453975199360, 138827782196768016] |