[1,3,6,10,15,21,28,36,45,1,2,4,7,11,16,22,29,37,
46,3,4,6,9,13,18,24,31,39,48,6,7,9,12,16,21,27,34,
42,51,10,11,13,16,20,25,31,38,46,55,15,16,18,21,
25,30,36,43,51,60,21,22,24,27,31,36,42,49,57,66,
28,29,31,34,38,43,49,56,64,73,36,37,39,42,46,51,
57,64,72,81]
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