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A118048
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Column 2 of triangle A118045; also equals a bisection of A118035, which is column 2 of A118032.
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4
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3, 15, 57, 192, 567, 1683, 4392, 12084, 29073, 75753, 172269, 430248, 938784, 2272308, 4793652, 11202642, 22952439, 52535655, 105206253, 233047158, 455660913, 996014343, 1917372474, 4062940566, 7660442568, 16114463106
(list; graph; refs; listen; history; internal format)
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