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A099214
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a(n)=4a(n-1)-4a(n-2)+4a(n-3).
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3
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1, 2, 4, 12, 40, 128, 400, 1248, 3904, 12224, 38272, 119808, 375040, 1174016, 3675136, 11504640, 36014080, 112738304, 352915456, 1104764928, 3458351104, 10826006528, 33889681408, 106088103936, 332097716224, 1039597174784
(list; graph; refs; listen; history; internal format)
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