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1, 0, 2, -1, 1, 3, -2, 0, 2, 4, -3, -1, 1, 3, 5, -4, -2, 0, 2, 4, 6, -5, -3, -1, 1, 3, 5, 7, -6, -4, -2, 0, 2, 4, 6, 8, -7, -5, -3, -1, 1, 3, 5, 7, 9, -8, -6, -4, -2, 0, 2, 4, 6, 8, 10
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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COMMENTS
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LINKS
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FORMULA
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a(n) = 2*n-(t+1)^2, where t = floor((-1+sqrt(8*n-7))/2) n > 0. (End)
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EXAMPLE
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First few rows of the triangle are:
1;
0, 2;
-1, 1, 3;
-2, 0, 2, 4;
-3, -1, 1, 3, 5;
-4, -2, 0, 2, 4, 6;
-5, -3, -1, 1, 3, 5, 7;
...
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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