1, 2, 4, 7, 11, 16, 22, 29, 37, 46, 56, 67, 79, 92, 106, 121, ...
0 1 1 2 2 4 3 7 4 11 5 16 6 22 7 29 8 37 9 46 10 56 11 67 12 79 13 92 14 106 15 121
0 0 1 1 2 3 3 6 4 10 5 15 6 21 7 28 8 36 9 45 10 55 11 66 12 78 13 91 14 105 15 120
RS
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