First entry of the vector (M^n)v, where M is the 2 X 2 matrix [[0,4],[1,4]] and v is the column vector [0,1].
0, 4, 16, 80, 384, 1856, 8960, 43264, 208896, 1008640, 4870144, 23515136
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Sun Jan 11 23:36:02 CET 2009 [seqfan] Index of linear recurrences