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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -5 |
| 3 | 10 |
| 4 | 25 |
| 5 | -170 |
| 6 | -575 |
| 7 | 6370 |
| 8 | 28225 |
| 9 | -415826 |
| 10 | -2294975 |
| 11 | 41649850 |
| 12 | 275622625 |
| 13 | -5922729722 |
| 14 | -45718037855 |
| 15 | 1134081384850 |
| 16 | 10004182986625 |
| 17 | -281284596509858 |
| 18 | -2791456543622015 |
| 19 | 87722769712529770 |
| 20 | 967282878165054625 |
| 21 | -33597252908389628234 |
| 22 | -407509096583935700255 |
[0,1,-5,10,25,-170,-575,6370,28225,-415826, -2294975,41649850,275622625,-5922729722, -45718037855,1134081384850,10004182986625, -281284596509858,-2791456543622015, 87722769712529770,967282878165054625, -33597252908389628234,-407509096583935700255] |