19/02/28 05:35:45.19 aw3Q4b2L.net
>>271
こういうことか
a(n)=(81/25)n^2-(2/3)n-(17/40)-((1/60)n^2-(1/10)n-(721/360))(-1)^n
+((5-√5)/25)cos(πn/5)-√((5-√5)/250)sin(πn/5)-((75+43√5)/125)cos(2πn/5)+(√((50-22√5)/3125)n-√((25-11√5)/50))sin(2πn/5)
+((5+√5)/25)cos(3πn/5)+√((5+√5)/250)sin(3πn/5)-((75-43√5)/125)cos(4πn/5)+(√((50+22√5)/3125)n+√((25+11√5)/50))sin(4πn/5)
-((2-√2)/4)cos(πn/4)+((2-3√2)/4)sin(πn/4)-((2+√2)/4)cos(3πn/4)-((2+3√2)/4)sin(3πn/4)
+(2/9)cos(πn/3)-(2√3/9)sin(2πn/3)+sin(πn/2)+sinc(x)+4sinc(x-1)-2sinc(x-2)+2sinc(x-3)-2sinc(x-4)