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A016922
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a(n) = (6*n+1)^2.
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25
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1, 49, 169, 361, 625, 961, 1369, 1849, 2401, 3025, 3721, 4489, 5329, 6241, 7225, 8281, 9409, 10609, 11881, 13225, 14641, 16129, 17689, 19321, 21025, 22801, 24649, 26569, 28561, 30625, 32761, 34969, 37249, 39601, 42025, 44521, 47089, 49729, 52441, 55225
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OFFSET
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0,2
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COMMENTS
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Except for 2, exponents e such that x^e-x+1 is reducible.
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LINKS
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FORMULA
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G.f.: ( 1+46*x+25*x^2 ) / (1-x)^3. - R. J. Mathar, Mar 10 2011
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MAPLE
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MATHEMATICA
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Table[(6n+1)^2, {n, 0, 100}] (* or *)
CoefficientList[Series[(1 + 46*x + 25*x^2)/(1 - x)^3, {x, 0, 30}], x] (* Wesley Ivan Hurt, Oct 13 2014 *)
LinearRecurrence[{3, -3, 1}, {1, 49, 169}, 50] (* Harvey P. Dale, Feb 17 2023 *)
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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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STATUS
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approved
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