MatrixPower[{{0,1,0,0,0,0,0,0},{1,0,1,0,0,0,0,0},{0,1,0,1,0,0,0,0},{0,0,1,0,1,0,0,0},{0,0,0,1,0,1,0,0},{0,0,0,0,1,0,1,0},{0,0,0,0,0,1,0,1},{0,0,0,0,0,0,1,0}},21]

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