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A068344
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Square array read by antidiagonals of T(n,k) = sign(n-k).
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0
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0, -1, 1, -1, 0, 1, -1, -1, 1, 1, -1, -1, 0, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 0, 1, 1, 1, -1, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, -1, 0, 1, 1, 1, 1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, 0, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1
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OFFSET
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0,1
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LINKS
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FORMULA
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a(n) = sign(A002260(n) - A004736(n)) or a(n) = sign((n-t(t+1)/2) - (t*t+3*t+4)/2-n)) where t = floor((-1+sqrt(8*n-7))/2). - Boris Putievskiy, Dec 24 2012
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EXAMPLE
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The start of the array is:
0;
-1,...1;
-1,...0,...1;
-1,..-1,...1,...1;
-1,..-1,...0,...1,...1;
. . .
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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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