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A024743
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a(n) = Sum (a(2i-1)*a(n-2i+1), i = 1,2,...,k), where k = [ (n+1)/4 ].
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1
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3, 1, 2, 6, 18, 54, 174, 558, 1782, 5694, 19170, 64206, 214050, 712566, 2465694, 8480310, 29012526, 99157446, 348577698, 1219546278, 4248000882, 14773851366, 52521676254, 185880813822, 655167175446, 2306629089486, 8261570136834, 29484704469390
(list; graph; refs; listen; history; internal format)
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