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A166114
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a(n)=(6-(-4)^n)/5.
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2
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1, 2, -2, 14, -50, 206, -818, 3278, -13106, 52430, -209714, 838862, -4677718, 17388602, -70876678, 282184442, -1130060038, 4518917883, -18076993798, 72306652922, -289227933958, 1156910413562, -4627642976518, 18510570583802
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