Let a1 = b1 = 1, an = an–1 + 2 and bn = an + bn–1 for every natural number n ≥ 2.

Let a₁ = b₁ = 1, a_n = a_n–1 + 2 and b_n = a_n + b_n–1 for every natural number n ≥ 2. Then \(\sum\limits_{n = 1}^{15} a_n \,.b_n \) is equal to _______.

Let a1 = b1 = 1, an = an–1 + 2 and bn = an + bn–1 for every natural number n ≥ 2.

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