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A250121
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Crystal ball sequence for planar net 3.3.3.3.6.
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1
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1, 6, 15, 30, 49, 73, 102, 135, 174, 217, 265, 318, 375, 438, 505, 577, 654, 735, 822, 913, 1009, 1110, 1215, 1326, 1441, 1561, 1686, 1815, 1950, 2089, 2233, 2382, 2535, 2694, 2857, 3025, 3198, 3375, 3558, 3745, 3937, 4134
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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G.f.: (x^2+x+1)*(x^4+3*x^3+3*x+1)/((x^4+x^3+x^2+x+1)*(1-x)^3).
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MATHEMATICA
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CoefficientList[Series[(x^2+x+1)*(x^4+3*x^3+3*x+1)/((x^4+x^3+x^2+x+1)*(1-x)^3), {x, 0, 41}], x] (* Georg Fischer, Jul 19 2020 *)
LinearRecurrence[{2, -1, 0, 0, 1, -2, 1}, {1, 6, 15, 30, 49, 73, 102}, 50] (* Harvey P. Dale, Apr 30 2022 *)
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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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