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A052153
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Rhombi (in 3 different orientations) in a rhombus with 60 degree acute angles.
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1
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1, 9, 26, 54, 95, 151, 224, 316, 429, 565, 726, 914, 1131, 1379, 1660, 1976, 2329, 2721, 3154, 3630, 4151, 4719, 5336, 6004, 6725, 7501, 8334, 9226, 10179, 11195, 12276, 13424, 14641, 15929, 17290, 18726, 20239, 21831, 23504, 25260
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| See link for corrections to table in Ask Dr. Math link.
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LINKS
| Ask Dr. Math, Finding Rhombi in a Rhombus, Source, about 2/3rds down, message dated 01/18/2000.
Ray Chandler, Corrections to table in Ask Dr. Math link.
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FORMULA
| a(n) = A000330(n) + A046092(n-1).
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MATHEMATICA
| Table[n*(n+1)*(2n+1)/6+2n*(n-1), {n, 50}] (* Ray Chandler, May 05 2011 *)
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CROSSREFS
| Cf. A000330, A000537, A006003, A046092.
Sequence in context: A075395 A085367 A081267 * A154560 A048468 A048771
Adjacent sequences: A052150 A052151 A052152 * A052154 A052155 A052156
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KEYWORD
| nonn
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AUTHOR
| Tom Gray (TGray9278(AT)aol.com), Jan 24 2000
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EXTENSIONS
| Better description from Larry Reeves (larryr(AT)acm.org), Mar 21 2001
Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), May 05 2011
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