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A128418
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a(n)=sum{k=0..n, 2^(n-k)*C(2n,n-k)}.
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1
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1, 5, 33, 233, 1697, 12585, 94449, 714873, 5445441, 41687369, 320420753, 2471008281, 19108837601, 148123058153, 1150532419377, 8952614975673, 69772391628417, 544532315255433, 4255064364533457
(list; graph; refs; listen; history; internal format)
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