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A001446
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a(n) = (4^n + 4^[ n/2 ] )/2.
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1
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10, 34, 136, 520, 2080, 8224, 32896, 131200, 524800, 2097664, 8390656, 33556480, 134225920, 536879104, 2147516416, 8589967360, 34359869440, 137439084544, 549756338176, 2199023779840, 8796095119360
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