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| n | a(n) |
|---|---|
| 5 | 0 |
| 6 | 1 |
| 7 | 568 |
| 8 | 116004 |
| 9 | 15998985 |
| 10 | 1839569920 |
| 11 | 194498568156 |
| 12 | 19903875199488 |
| 13 | 2028587719434848 |
| 14 | 209368404017676288 |
| 15 | 22100537701746000000 |
| 16 | 2400300773277150740480 |
| 17 | 269182253907724040230656 |
| 18 | 31234215889947671471849472 |
| 19 | 3753858472917234012947022848 |
| 20 | 467486957946431078400000000000 |
[0,1,568,116004,15998985,1839569920,194498568156, 19903875199488,2028587719434848, 209368404017676288,22100537701746000000, 2400300773277150740480,269182253907724040230656, 31234215889947671471849472, 3753858472917234012947022848, 467486957946431078400000000000] |