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A073429
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Upper triangular region of the table A073345.
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4
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1, 0, 1, 0, 0, 2, 0, 0, 1, 4, 0, 0, 0, 6, 8, 0, 0, 0, 6, 20, 16, 0, 0, 0, 4, 40, 56, 32, 0, 0, 0, 1, 68, 152, 144, 64, 0, 0, 0, 0, 94, 376, 480, 352, 128, 0, 0, 0, 0, 114, 844, 1440, 1376, 832, 256, 0, 0, 0, 0, 116, 1744, 4056, 4736, 3712, 1920, 512, 0, 0, 0, 0, 94, 3340, 10856, 15248, 14272, 9600, 4352, 1024
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OFFSET
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0,6
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LINKS
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EXAMPLE
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Triangle T(n,k) begins:
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ...
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, ...
2, 1, 0, 0, 0, 0, 0, 0, 0, ...
4, 6, 6, 4, 1, 0, 0, 0, ...
8, 20, 40, 68, 94, 114, 116, ...
16, 56, 152, 376, 844, 1744, ...
32, 144, 480, 1440, 4056, ...
64, 352, 1376, 4736, ...
128, 832, 3712, ...
256, 1920, ...
512, ...
...
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MAPLE
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A002262 := n -> n - binomial(floor((1/2)+sqrt(2*(1+n))), 2);
A003056 := n -> floor(sqrt(2*(1+n))-(1/2));
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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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