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A025577
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G.f.: (x/(1-x))*sqrt((1+x)/(1-3*x)).
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1
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1, 3, 7, 17, 43, 113, 305, 839, 2339, 6585, 18677, 53283, 152725, 439455, 1268623, 3672457, 10656691, 30988249, 90275989, 263425651, 769801873, 2252531971, 6599018227, 19353381877, 56814946381, 166940119063, 490930181515, 1444813563869
(list; graph; refs; listen; history; internal format)
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