[1,3,3,6,5,6,10,8,9,10,15,12,13,14,15,21,17,18,19, 20,21,28,23,24,25,26,27,28,36,30,31,32,33,34,35, 36,45,38,39,40,41,42,43,44,45,55,47,48,49,50,51, 52,53,54,55]