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A018217
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Sum(C(j)*(n-j)*4^(n-j),j=0..n-1), C = Catalan numbers.
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0
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0, 4, 36, 232, 1300, 6744, 33320, 159184, 742068, 3395320, 15308920, 68213424, 300999816, 1317415792, 5726300880, 24742452128, 106357582324, 455122855224, 1939780103768, 8238185701360, 34876073003352
(list; graph; refs; listen; history; internal format)
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