A138614 - OEIS

A138614

Expansion of (2*x-1)*(x^2-x-1) / ( 1-2*x^2+2*x^4 ).

1, -1, -1, 0, -4, 2, -6, 4, -4, 4, 4, 0, 16, -8, 24, -16, 16, -16, -16, 0, -64, 32, -96, 64, -64, 64, 64, 0, 256, -128, 384, -256, 256, -256, -256, 0, -1024, 512, -1536, 1024, -1024, 1024, 1024, 0, 4096, -2048, 6144, -4096, 4096, -4096, -4096

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OFFSET

0,5

LINKS

Table of n, a(n) for n=0..50.

Index entries for linear recurrences with constant coefficients, signature (0,2,0,-2).

FORMULA

a(n)= -4a(n-8).

a(n) = A138231(n+1)-2*A138231(n).

a(n) = A138232(n)- A138231(n).

MATHEMATICA

LinearRecurrence[{0, 2, 0, -2}, {1, -1, -1, 0}, 60] (* Harvey P. Dale, Jul 31 2023 *)

CROSSREFS

Sequence in context: A059853 A136527 A246776 * A161912 A162339 A200697

Adjacent sequences: A138611 A138612 A138613 * A138615 A138616 A138617

KEYWORD

sign,easy

AUTHOR

Paul Curtz, May 14 2008

STATUS

approved