[0,1,1,2,3,4,4,5,6,7,8,9,9,10,11,11,12,13,14,15, 15,16,17,17,18,19,20,21,22,23,23,24,25,25,26,26, 27,28,29,30,31,32,32,33,34,34,35,35,36,37,38,39, 40,41,42,43,43,44,45,45,46,46,47,47,48,49,50,51]