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J= 1 . 2(1) + 2 . 2(2) +3 . 2(3) +......+ 15 . 2(15)
el termino general es n(2n)=2n^2
J= 2(1^2) + 2(2^2) + 2(3^2) +......+ 2(15^2)
J= 2{(1^2) + (2^2) +(3^2) +......+ (15^2)}
J= 2{15(16)(31)}/6
J= 2 480