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 A091095 Expansion of (1+4x-24x^2)/((1-4x)(1+4x)). 0
 1, 4, -8, 64, -128, 1024, -2048, 16384, -32768, 262144, -524288, 4194304, -8388608, 67108864, -134217728, 1073741824, -2147483648, 17179869184, -34359738368, 274877906944, -549755813888, 4398046511104, -8796093022208, 70368744177664 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS a(0)=1, a(2n-1)=k^(2n-1), a(2n)=(2-k)k^(2n-1), k=4; G.f.: (1+kx+(2-2k)kx^2)/((1-kx)(1+kx)), k=4. LINKS Index entries for linear recurrences with constant coefficients, signature (0,16). FORMULA a(n)=4^n/4+(-3)(-4)^n/4+6*0^n/4 MATHEMATICA LinearRecurrence[{0, 16}, {1, 4, -8}, 30] (* Harvey P. Dale, Dec 14 2019 *) CROSSREFS Sequence in context: A214590 A215713 A120777 * A075787 A086891 A117636 Adjacent sequences:  A091092 A091093 A091094 * A091096 A091097 A091098 KEYWORD easy,sign AUTHOR Paul Barry, Dec 19 2003 STATUS approved

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Last modified January 15 12:14 EST 2021. Contains 340187 sequences. (Running on oeis4.)