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para n = 1 ( 1 ) ² - 3 ( 1 ) + 3 = 1 - 3 + 3 = 1
para n = 2 ( 2 ) ² - 3 ( 2 ) + 3 = 4 - 6 + 3 = 1
para n = 3 ( 3 ) ² - 3 ( 3 ) + 3 = 9 - 9 + 3 = 3
para n = 4 ( 4 )² - 3 ( 4 ) + 3 = 16 - 12 + 3 = 7
La expresión puede encontrarse usando el método de diferencias.