Start at the top line left end and travel to the bottom line
right end by continuously moving from square to square horizontally ,vertically
or diagonally to find the sequence
:2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768,65536,131072,262144,524288,
1048576,2097152.Visit each square once only.
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