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0, 4, 76, 344, 936, 1980, 3604, 5936, 9104, 13236, 18460, 24904, 32696, 41964, 52836, 65440, 79904, 96356, 114924, 135736, 158920, 184604, 212916, 243984, 277936, 314900, 355004, 398376, 445144, 495436, 549380, 607104, 668736, 734404, 804236
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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REFERENCES
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Dan Hoey, Bill Gosper and Richard C. Schroeppel, Discussions in Math-Fun Mailing list, circa Jul 13 1999.
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LINKS
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FORMULA
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A polynomial in n of degree 3.
a(n) = 4*a(n-1)-6*a(n-2)+4*a(n-3)-a(n-4) for n>4.
G.f.: 4*x^2*(1+15*x+16*x^2) / (1-x)^4.
(End)
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MATHEMATICA
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PROG
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(PARI) concat(0, Vec(4*x^2*(1+15*x+16*x^2)/(1-x)^4 + O(x^60))) \\ Colin Barker, Aug 28 2016
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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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EXTENSIONS
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STATUS
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approved
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