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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 12 |
| 5 | 320 |
| 6 | 10890 |
| 7 | 640836 |
| 8 | 68362504 |
| 9 | 13369203792 |
| 10 | 4852623272670 |
| 11 | 3314874720579180 |
| 12 | 4318786169776866612 |
| 13 | 10854838945689940034808 |
| 14 | 53111101422881446287824390 |
| 15 | 509319855642185873306564196780 |
| 16 | 9619620856997967197817249800046480 |
[0,0,0,12,320,10890,640836,68362504,13369203792, 4852623272670,3314874720579180, 4318786169776866612,10854838945689940034808, 53111101422881446287824390, 509319855642185873306564196780, 9619620856997967197817249800046480] |