[1,1,1,2,3,1,2,6,5,1,2,8,12,7,1,2,10,20,20,9,1,2, 12,30,40,30,11,1,2,14,42,70,70,42,13,1,2,16,56, 112,140,112,56,15,1,2,18,72,168,252,252,168,72,17, 1,2,20,90,240,420,504,420,240,90,19,1]