[1,1,2,3,2,3,1,4,2,5,1,6,4,5,7,2,7,5,6,3,8,5,8,4, 9,1,10,3,10,7,8,11,4,11,7,10,6,11,2,13,9,10,7,12, 1,14,2,15,8,13,4,15,1,16,10,13,9,14,5,16,2,17,12, 13,11,14,9,16,5,18,8,17,19,7,18,10,17,6,19,1,20,3, 20,14,15,12,17]