(n,0)+(n,4)+(n,8)+・・・=(2^n+2^n/2・2cosnπ/4)/4
(n,1)+(n,5)+(n,9)+・・・=(2^n+2^n/2・2cos(n-2)π/4)/4
(n,2)+(n,6)+(n,10)+・・・=(2^n+2^n/2・2cos(n-4)π/4)/4
(n,3)+(n,7)+(n,11)+・・・=(2^n+2^n/2・2cos(n-6)π/4)/4
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(n,0)+(n,5)+(n,10)+・・・=(2^n+φ^n・2cosnπ/5+φ^-n・2cosn2π/5)/5
k=1のとき,n→n-2
k=2のとき,n→n-4
k=3のとき,n→n-6
k=4のとき,n→n-8
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