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A090894
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Numbers in n-th downward diagonal of triangle T : 0; 1, 2; 3, 4, 5; 6, 7, 8, 9; ...
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2
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0, 1, 2, 3, 4, 6, 5, 7, 10, 8, 11, 15, 9, 12, 16, 21, 13, 17, 22, 28, 14, 18, 23, 29, 36, 19, 24, 30, 37, 45, 20, 25, 31, 38, 46, 55, 26, 32, 39, 47, 56, 66, 27, 33, 40, 48, 57, 67, 78, 34, 41, 49, 58, 68, 79, 91, 35, 42, 50, 59, 69, 80, 92, 105, 43, 51, 60, 70, 81, 93, 106, 120
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OFFSET
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0,3
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COMMENTS
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Also the skewed triangle read by nonzero columns:
1, 2
0, 3, 4, 5
0, 0, 6, 7, 8, 9
0, 0, 0, 10,11,12,13,14
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LINKS
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FORMULA
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As skewed triangle: T(n,k) = (n+1)*(n+2)/2 + k-n, for n <= k <= 2n+2. - Ralf Stephan, Mar 09 2014
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CROSSREFS
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See also A091018 (upward diagonal).
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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