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1*2+2*3+3*4+...+n(n+1) formula
1*2+2*3+3*4+...+n(n+1) formula
1*2*3*4*5*n formula
2^n-1 formula
1^1+2^2+3^3+...+n^n formula
2^0+2^1+...+2^n-1 formula