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Recursionmedium
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Given d1=17d_1 = 17d1​=17, d2=18d_2 = 18d2​=18, and dn=dn−1+dn−2d_n = d_{n-1} + d_{n-2}dn​=dn−1​+dn−2​ for ngeq3n \\geq 3ngeq3, what is d4d_4d4​?