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A038167
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G.f.: x*(1+3*x+x^2)/((1-x^2)^2*(1-x^5)).
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1
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0, 1, 3, 3, 6, 5, 10, 10, 15, 15, 20, 21, 28, 28, 36, 35, 45, 45, 55, 55, 65, 66, 78, 78, 91, 90, 105, 105, 120, 120, 135, 136, 153, 153, 171, 170, 190, 190, 210, 210, 230, 231, 253, 253, 276, 275, 300, 300, 325, 325, 350, 351, 378, 378, 406, 405
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OFFSET
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0,3
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REFERENCES
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S. J. Cyvin et al., Polygonal systems including the corannulene and coronene homologs: novel applications of Pólya's theorem, Z. Naturforsch., 52a (1997), 867-873.
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LINKS
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FORMULA
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MAPLE
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A010891 := proc(n) op((n mod 5)+1, [1, -1, 0, 0, 0]) ; end:
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MATHEMATICA
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CoefficientList[Series[x (1+3x+x^2)/((1-x^2)^2(1-x^5)), {x, 0, 60}], x] (* or *) LinearRecurrence[{0, 2, 0, -1, 1, 0, -2, 0, 1}, {0, 1, 3, 3, 6, 5, 10, 10, 15}, 60] (* Harvey P. Dale, Aug 03 2017 *)
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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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