https://s0.wp.com/latex.php?latex=a_%7Bn%2B1%7D%3D%5Cdfrac%7Ba_n%5E2%2Bc%7D%7Ba_%7Bn-1%7D%7D%5Cforall+n%5Cgeq+2.&bg=ffffff&fg=1a1a1a&s=0