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A162852
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a(n) = 3*a(n-2) for n > 2; a(1) = 3, a(2) = -1.
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2
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3, -1, 9, -3, 27, -9, 81, -27, 243, -81, 729, -243, 2187, -729, 6561, -2187, 19683, -6561, 59049, -19683, 177147, -59049, 531441, -177147, 1594323, -531441, 4782969, -1594323, 14348907, -4782969, 43046721, -14348907, 129140163
(list; graph; refs; listen; history; internal format)
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