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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 12 |
| 3 | 0 |
| 4 | 10640 |
| 5 | 120960 |
| 6 | 74771136 |
| 7 | 4123159040 |
| 8 | 2129817514240 |
| 9 | 315733300850688 |
| 10 | 176225504731384832 |
| 11 | 52096908207506505728 |
| 12 | 34345862831326069035008 |
| 13 | 16865198263103149299957760 |
[1,0,12,0,10640,120960,74771136,4123159040, 2129817514240,315733300850688,176225504731384832, 52096908207506505728,34345862831326069035008, 16865198263103149299957760] |