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A027420
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Triangle T00, T10, T01, T20, T11, T02 etc. where Tmn = number of distinct products ij with min(m,n)<=i,j<=max(m,n).
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0
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1, 2, 2, 4, 1, 4, 7, 3, 3, 7, 10, 6, 1, 6, 10, 15, 9, 3, 3, 9, 15, 19, 14, 6, 1, 6, 14, 19, 26, 18, 10, 3, 3, 10, 18, 26, 31, 25, 14, 6, 1, 6, 14, 25, 31, 37, 30, 20, 10, 3, 3, 10, 20, 30, 37, 43, 36, 25, 15, 6, 1, 6, 15, 25, 36, 43, 54, 42, 31, 20, 10, 3, 3, 10, 20, 31, 42, 54
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