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A097335
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Sum k=0..n, C(n-k, floor(k/2))3^k.
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2
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1, 4, 4, 13, 49, 85, 202, 643, 1408, 3226, 9013, 21685, 50719, 131836, 327001, 783472, 1969996, 4913005, 11964253, 29694217, 73911262, 181589539, 448837492, 1114038850, 2748344701, 6787882129, 16814231779, 41549334088, 102640273249
(list; graph; refs; listen; history; internal format)
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