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A056237
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a(n) = 2*n^2 + 9*n - 5.
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0
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6, 21, 40, 63, 90, 121, 156, 195, 238, 285, 336, 391, 450, 513, 580, 651, 726, 805, 888, 975, 1066, 1161, 1260, 1363, 1470, 1581, 1696, 1815, 1938, 2065, 2196, 2331, 2470, 2613, 2760, 2911, 3066, 3225, 3388, 3555, 3726, 3901, 4080, 4263, 4450, 4641, 4836, 5035
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listen;
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OFFSET
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1,1
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REFERENCES
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Michael Serra, Discovering geometry: an inductive approach, 2nd ed., Berkeley, Calif.: Key Curriculum Press, 1997, p. 61, Problem 8.
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LINKS
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MATHEMATICA
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CROSSREFS
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KEYWORD
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nonn,easy,less
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AUTHOR
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Pam Smith (homelizard(AT)aol.com), Aug 20 2000
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EXTENSIONS
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Name clarified by Editors of OEIS, May 24 2021
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STATUS
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approved
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