ichisemasashi
Results
1
comments of
ichisemasashi
I have a similer problem ``` $$D^2_N = \left\{\begin{array}{c} D^2_{N-1} + 2D_{N-1} + 1\\ or\\ D^2_{N-1} - 2D_{N-1} + 1 \end{array}\right. \tag{6.7}$$ ``` preview is  pdf is 