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A333033
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Number of quadrilateral regions in an equilateral triangular "frame" of size n (see Comments in A328526 for definition),
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4
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0, 0, 24, 102, 252, 504, 867, 1431, 2214, 3228, 4509, 6237, 8481, 11259, 14445, 18261, 22935, 28497, 34980, 42762, 51708, 61632, 72795, 85791, 100611, 117027, 134874, 154836, 177402, 202548, 230355, 261543, 295707, 332271, 371313, 413937, 460881, 511551
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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COMMENTS
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See A328526 for images of the triangular frame.
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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