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A106691 G.f. (1+x-2*x^2+x^3+x^4)/((x-1)^2*(2*x+1)^2*(x+1)^2). 0
1, -3, 8, -17, 36, -71, 140, -269, 516, -979, 1852, -3481, 6516, -12127, 22444, -41253, 75236, -135915, 242716, -427185, 737876, -1242743, 2019468, -3106877, 4349636, -4971011, 2485500, 9942071, -49710284, 159072881, -437450388, 1113510059, -2704238684, 6362914533, -14634703396 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..34.

Index entries for linear recurrences with constant coefficients, signature (-4,-2,8,7,-4,-4).

MATHEMATICA

CoefficientList[Series[(1+x-2x^2+x^3+x^4)/((x-1)^2(2x+1)^2(x+1)^2), {x, 0, 40}], x] (* oe *) LinearRecurrence[{-4, -2, 8, 7, -4, -4}, {1, -3, 8, -17, 36, -71}, 40] (* Harvey P. Dale, Dec 21 2015 *)

PROG

Floretion Algebra Multiplication Program, FAMP Code: 2jbasekrokseq[ - .25'i - .25i' + 'ii' + .25'jk' + .25'kj'], RokType: Y[sqa.Findk()] = Y[sqa.Findk()] - p (internal program code)

CROSSREFS

Cf. A002697.

Sequence in context: A052996 A112523 A147419 * A140176 A238496 A097391

Adjacent sequences:  A106688 A106689 A106690 * A106692 A106693 A106694

KEYWORD

sign,easy

AUTHOR

Creighton Dement, May 13 2005

STATUS

approved

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Last modified September 25 21:33 EDT 2017. Contains 292500 sequences.