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A068554
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n*binomial(2n,n) - 4^n.
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0
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-1, -2, -4, -4, 24, 236, 1448, 7640, 37424, 175436, 798984, 3565448, 15672656, 68098936, 293196944, 1253020976, 5322318944, 22491436556, 94632958664, 396682105256, 1657418948624, 6905368852136, 28697991157424, 119000162557136
(list; graph; refs; listen; history; internal format)
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