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A165553
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a(n)= (3/2)*(1+(-3)^(n-1)).
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2
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1, 3, -3, 15, -39, 123, -363, 1095, -3279, 9843, -29523, 88575, -265719, 797163, -2391483, 7174455, -21523359, 64570083, -193710243, 581130735, -1743392199, 5230176603, -15690529803, 47071589415, -141214768239
(list; graph; refs; listen; history; internal format)
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