Akm = {{0, 0, A(0,0)} , 
       {6, 0, A(6,0)} , 
       {6,-2, (-1/2)*((sqrt(21))*(A(6,0)))} , 
       {6, 2, (-1/2)*((sqrt(21))*(A(6,0)))} , 
       {6,-4, (-1)*((sqrt(7/2))*(A(6,0)))} , 
       {6, 4, (-1)*((sqrt(7/2))*(A(6,0)))} , 
       {6,-6, (1/2)*((sqrt(105/11))*(A(6,0)))} , 
       {6, 6, (1/2)*((sqrt(105/11))*(A(6,0)))} }