6,14,30,62() ()找规律

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6,14,30,62() ()找规律

an = 2^(n+2) - 2
a1 = 2^3 - 2 = 8 - 2 = 6
a2 = 2^4 - 2 = 16 - 2 = 14
a3 = 2^5 - 2 = 32 - 2 = 30
a4 = 2^6 - 2 = 64 - 2 = 62
a5 = 2^7 - 2 = 128 - 2 = 126
a6 = 2^8 - 2 = 256 - 2 = 254

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