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A099216
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a(n)=4a(n-1)-4a(n-2)+2a(n-3).
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2
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1, 2, 4, 10, 28, 80, 228, 648, 1840, 5224, 14832, 42112, 119568, 339488, 963904, 2736800, 7770560, 22062848, 62642752, 177860736, 504997632, 1433833088, 4071063296, 11558916096, 32819077376, 93182771712, 264572609536
(list; graph; refs; listen; history; internal format)
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