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A160747
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G.f.: (1+10*x+20*x^2+10*x^3+x^4)/(1-x)^5.
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25
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1, 15, 85, 295, 771, 1681, 3235, 5685, 9325, 14491, 21561, 30955, 43135, 58605, 77911, 101641, 130425, 164935, 205885, 254031, 310171, 375145, 449835, 535165, 632101, 741651, 864865, 1002835, 1156695, 1327621, 1516831, 1725585, 1955185, 2206975
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Ehrhart series for matroid K_4.
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REFERENCES
| J. A. De Loera, D. C. Haws and M. Koppe, Ehrhart Polynomials of Matroid Polytopes and Polymatroids, Discrete Comput. Geom., 42 (2009), 670-702.
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..10000
D. C. Haws, Matroids
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FORMULA
| a(n) = 1+7*n*(n+1)*(n^2+n+2)/4. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Dec 16 2009]
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PROG
| (MAGMA) [1+7*n*(n+1)*(n^2+n+2)/4: n in [0..40]]; // Vincenzo Librandi, Sep 18 2011
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CROSSREFS
| Sequence in context: A160599 A091286 A176070 * A064058 A138322 A206170
Adjacent sequences: A160744 A160745 A160746 * A160748 A160749 A160750
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Nov 18 2009
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