A078053 Expansion of (1-x)/(1+2*x-2*x^2-2*x^3).

1, -3, 8, -20, 50, -124, 308, -764, 1896, -4704, 11672, -28960, 71856, -178288, 442368, -1097600, 2723360, -6757184, 16765888, -41599424, 103216256, -256099584, 635432832, -1576632320, 3911931136, -9706261248, 24083120128, -59754900480, 148263518720, -367870598144

Offset

0,2

Links

Table of n, a(n) for n=0..29.

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

Mathematica

CoefficientList[Series[(1-x)/(1+2x-2x^2-2x^3), {x, 0, 30}], x] (* or *) LinearRecurrence[{-2, 2, 2}, {1, -3, 8}, 30] (* Harvey P. Dale, Dec 17 2017 *)

Crossrefs

Sequence in context: A085831 A332846 A178167 * A122595 A026582 A187003

Adjacent sequences: A078050 A078051 A078052 * A078054 A078055 A078056

Keyword

sign,easy

Author

N. J. A. Sloane, Nov 17 2002

Status

approved