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Teraz już będzie ok.
a(n) = 1 + 4 + 9 + 16 + ... + n² =
= 1 + 4 + 9 + ... + (n-1)² + n² =
= (((1 + 4 + 9 + ... + (n-1)²))) + n² =
= a(n-1) + n²
i oto cały wzór:
a(1) = 1
a(n) = a(n-1) + n²