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A129026
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a(n) = (1/2)*(n^4 + 11*n^3 + 53*n^2 + 97*n + 54).
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2
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0, 27, 108, 282, 600, 1125, 1932, 3108, 4752, 6975, 9900, 13662, 18408, 24297, 31500, 40200, 50592, 62883, 77292, 94050, 113400, 135597, 160908, 189612, 222000, 258375, 299052, 344358, 394632, 450225, 511500, 578832, 652608, 733227, 821100, 916650
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OFFSET
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-1,2
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REFERENCES
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Gordon G. Cash and Jerry Ray Dias, Computation, Properties and Resonance Topology of Benzenoid Monoradicals and Polyradicals and the Eigenvectors Belonging to Their Zero Eigenvalues, J. Math. Chem., 30 (2001), 429-444. [See Fig. 2.]
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LINKS
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FORMULA
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G.f.: -3*(4*x^2 - 9*x + 9) / (x-1)^5. - Colin Barker, Jul 27 2013
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MATHEMATICA
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Table[(n^4+11n^3+53n^2+97n+54)/2, {n, -1, 40}] (* Harvey P. Dale, Sep 24 2011 *)
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PROG
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(Magma) [(1/2)*(n^4+11*n^3+53*n^2+97*n+54): n in [-1..40]]; // Vincenzo Librandi, Sep 25 2011
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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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