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A113441 Second row of A113439. 1
1, 3, 12, 50, 212, 905, 3872, 16576, 70968, 303832, 1300737, 5568473, 23838453, 102051167, 436874885, 1870233780, 8006350999, 34274673894, 146727674181, 628131735844, 2688991567300, 11511399994065, 49279563214531 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..22.

Index entries for linear recurrences with constant coefficients, signature (9, -28, 38, -20, 1).

FORMULA

a(n) = A113439(4*n+1).

a(n) = 9*a(n-1) - 28*a(n-2) + 38*a(n-3) - 20*a(n-4) + a(n-5).

G.f.: -(1-6*x+13*x^2-12*x^3+4*x^4)/(-1+9*x-28*x^2+38*x^3-20*x^4+x^5).

MATHEMATICA

LinearRecurrence[{9, -28, 38, -20, 1}, {1, 3, 12, 50, 212}, 30] (* Harvey P. Dale, Apr 06 2013 *)

CoefficientList[Series[-(1 - 6*x + 13*x^2 - 12*x^3 + 4*x^4)/(-1 + 9*x - 28*x^2 + 38*x^3 - 20*x^4 + x^5), {x, 0, 50}], x] (* G. C. Greubel, Mar 11 2017 *)

PROG

(PARI) x='x+O('x^50); Vec(-(1-6*x+13*x^2-12*x^3+4*x^4)/(-1+9*x-28*x^2+38*x^3-20*x^4+x^5)) \\ G. C. Greubel, Mar 11 2017

CROSSREFS

Cf. A113439.

Sequence in context: A229665 A092443 A108080 * A119976 A074547 A151178

Adjacent sequences:  A113438 A113439 A113440 * A113442 A113443 A113444

KEYWORD

nonn

AUTHOR

Floor van Lamoen, Nov 04 2005

STATUS

approved

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Last modified June 13 00:57 EDT 2021. Contains 344980 sequences. (Running on oeis4.)