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. . Emergency mathematical accumulation method
Is it the analytical formula of An+ 1

After listing the equations, the left and right sides can eliminate a large piece.

The writing on the paper is wrong. High school mathematics has not been done for a long time, followed by a geometric series and a constant sequence.

an+ 1 = 2+( 1-3ˇn)/ 1-3+2(n- 1)= 3ˇn/2+2n- 1/2

3ˇn stands for the n power of 3.