1,3,5,7,9,11,13,□,,,

1,2,4,8,16,32,64,□,,,

1,1,2,3,5,8,13,21,□,,,

1,2,2,3,3,3,4,4,4,4,5,5,5,5,5,,,

1,2,4,5,7,9,10,12,14,16,17,19,21,23,25,,,

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an=[{1+(8n-7)1/2}/2]

bn=2n-[{1+(8n-7)1/2}/2]

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