First entry of the vector (M^n)v, where M is the 2 X 2 matrix [[0,-1],[1,4]] and v is the column vector [0,1].
0, 1, 4, 15, 56, 209, 780, 2911, 10864, 40545, 151316, 564719
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Sun Jan 11 23:36:02 CET 2009 [seqfan] Index of linear recurrences