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A333031
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Number of vertices in an equilateral triangle "frame" of size n (see Comments in A328526 for definition).
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6
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3, 10, 58, 183, 408, 777, 1323, 2142, 3276, 4773, 6717, 9264, 12507, 16554, 21351, 27090, 34047, 42318, 52008, 63453, 76566, 91371, 108249, 127608, 149487, 173982, 201072, 231225, 265002, 302487, 343857, 389856, 440175, 494670, 553611, 617610, 687477, 763320
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OFFSET
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1,1
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COMMENTS
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For n<=3 the terms equal A274585(n). 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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