ctbl:=[ [ 1, 891, 1980, 2816, 6336, 20736 ], [ 1, 243, -180, 512, -576, 0 ], [ 1, -99, 330, 176, -264, -144 ], [ 1, 33, 30, 8, 96, -168 ], [ 1, -27, -30, 32, 24, 0 ], [ 1, 9, 6, -40, -48, 72 ] ];