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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 28 |
| 5 | 490 |
| 6 | 15336 |
| 7 | 851368 |
| 8 | 85010976 |
| 9 | 15615858960 |
| 10 | 5388679220480 |
| 11 | 3548130389657216 |
| 12 | 4507988483733389568 |
| 13 | 11145255551131555572992 |
| 14 | 53964198507018134569758720 |
| 15 | 514158235191699333805861463040 |
| 16 | 9672967865350359173180572164444160 |
[0,0,1,3,28,490,15336,851368,85010976,15615858960, 5388679220480,3548130389657216, 4507988483733389568,11145255551131555572992, 53964198507018134569758720, 514158235191699333805861463040, 9672967865350359173180572164444160] |