A220438 a(n) = A220437(n)/2.

3, 14, 170, 1152, 10326, 78963, 656624, 5213426, 42439104, 340790424, 2756911059, 22212987398, 179367321962, 1446643119600, 11675121964830, 94190699548803, 760042877382104, 6132290825573090, 49480275246158592, 399234462516292656, 3221300621136623523, 25991449993525766654, 209716174247167839146

Offset

0,1

Links

Colin Barker, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (5,35,-67,-145,145,67,-35,-5,1).

Formula

G.f.: -(2*x^6-2*x^5-11*x^4+13*x^3-5*x^2-x+3) / ((x-1)*(x^4-11*x^3+25*x^2-11*x+1)*(x^4+7*x^3+13*x^2+7*x+1)). - Colin Barker, May 25 2015

Mathematica

LinearRecurrence[{5, 35, -67, -145, 145, 67, -35, -5, 1}, {3, 14, 170, 1152, 10326, 78963, 656624, 5213426, 42439104}, 30] (* Harvey P. Dale, May 27 2020 *)

Prog

(PARI) Vec(-(2*x^6-2*x^5-11*x^4+13*x^3-5*x^2-x+3) / ((x-1)*(x^4-11*x^3+25*x^2-11*x+1)*(x^4+7*x^3+13*x^2+7*x+1)) + O(x^100)) \\ Colin Barker, May 25 2015

Crossrefs

Cf. A220437.

Sequence in context: A272368 A108798 A260995 * A250001 A288559 A366715

Adjacent sequences: A220435 A220436 A220437 * A220439 A220440 A220441

Keyword

nonn,easy

Author

N. J. A. Sloane, Dec 16 2012

Status

approved