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e₁= (-1)² + 1 = 2
e₂= (-2)² + 2 = 6
e₃= (-3)² + 3 = 12
e₄= (-4)² + 4 = 18
e₅= (-5)² + 5 = 30
e1 = - 1² + 1 = 0
e2 = - 2² + 2 = -4 + 2 = -2
e3 = - 3² + 3 = - 9 + 3 = -6
e4 = - 4² + 4 = -16 + 4 = - 12
e5 = - 5² + 5 = -25 + 5 = - 20
e6 = - 6² + 6 = -36 + 6 = - 30