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A099215
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a(n)=4a(n-1)-4a(n-2)+3a(n-3).
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2
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1, 2, 4, 11, 34, 104, 313, 938, 2812, 8435, 25306, 75920, 227761, 683282, 2049844, 6149531, 18448594, 55345784, 166037353, 498112058, 1494336172, 4483008515, 13449025546, 40347076640, 121041229921, 363123689762, 1089371069284
(list; graph; refs; listen; history; internal format)
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