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A098924
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45-gonal numbers: n*(43*n-41)/2.
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1
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1, 45, 132, 262, 435, 651, 910, 1212, 1557, 1945, 2376, 2850, 3367, 3927, 4530, 5176, 5865, 6597, 7372, 8190, 9051, 9955, 10902, 11892, 12925, 14001, 15120, 16282, 17487, 18735, 20026, 21360, 22737, 24157, 25620, 27126, 28675, 30267
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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a(n) = n*(43*n-41)/2.
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MATHEMATICA
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CoefficientList[Series[(1+42*x)/(1-x)^3, {x, 0, 50}], x] (* Vincenzo Librandi, Jul 08 2012 *)
LinearRecurrence[{3, -3, 1}, {1, 45, 132}, 40] (* Harvey P. Dale, Jan 24 2015 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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