[1,4,3,2,9,8,7,6,5,16,15,14,13,12,11,10,25,24,23, 22,21,20,19,18,17,36,35,34,33,32,31,30,29,28,27, 26,49,48,47,46,45,44,43,42,41,40,39,38,37,64,63, 62,61,60,59,58,57,56,55,54,53,52,51,50,81,80,79, 78,77]