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A333032
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Number of triangular regions in an equilateral triangular "frame" of size n (see Comments in A328526 for definition),
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4
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1, 12, 48, 147, 291, 519, 879, 1383, 2079, 3039, 4359, 5991, 7983, 10515, 13731, 17571, 22131, 27543, 33951, 41271, 49599, 59355, 70779, 83499, 97611, 113763, 132243, 152619, 175035, 199707, 226827, 256443, 288747, 324603, 364395, 407139, 452979, 503319
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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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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