19/01/30 01:13:09.30 Q/seRUAS.net
>>534
d_n = {-9/(n-1) +49/(n-2) -105/(n-3) +945/(n-4) -1225/(n-5) +231/(n-6) -3213/(n-7) +65/(n-8)}
* (n-1)(n-2)(n-3)(n-4)(n-5)(n-6)(n-7)(n-8)
= {-233n^7 +6734n^6 -79190n^5 +488810n^4 -1699877n^3 +3304256n^2 -3286260n+1269000)/360,