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A027964 T(n,n+4), T given by A027960. 6
1, 7, 26, 73, 174, 373, 743, 1404, 2552, 4506, 7784, 13226, 22193, 36889, 60882, 99947, 163430, 266455, 433495, 704150, 1142496, 1852212, 3001056, 4860468, 7869649, 12739243, 20619098, 33369709, 54001422, 87385081 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 4..1000

Index entries for linear recurrences with constant coefficients, signature (5,-9,6,1,-3,1).

FORMULA

G.f.: x^4*(1+2*x)/((1-x)^4*(1-x-x^2)). - Ralf Stephan, Feb 07 2004

MATHEMATICA

Drop[CoefficientList[Series[x^4*(1+2*x)/((1-x)^4*(1-x-x^2)), {x, 0, 40}], x], 4] (* G. C. Greubel, Jun 29 2019 *)

PROG

(PARI) my(x='x+O('x^40)); Vec(x^4*(1+2*x)/((1-x)^4*(1-x-x^2))) \\ G. C. Greubel, Jun 29 2019

(MAGMA) R<x>:=PowerSeriesRing(Integers(), 40); Coefficients(R!( x^4*(1+2*x)/((1-x)^4*(1-x-x^2)) )); // G. C. Greubel, Jun 29 2019

(Sage) a=(x^4*(1+2*x)/((1-x)^4*(1-x-x^2))).series(x, 40).coefficients(x, sparse=False); a[4:] # G. C. Greubel, Jun 29 2019

CROSSREFS

Sequence in context: A053346 A227021 A180669 * A183957 A078501 A247557

Adjacent sequences:  A027961 A027962 A027963 * A027965 A027966 A027967

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified October 18 15:21 EDT 2019. Contains 328162 sequences. (Running on oeis4.)