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 A132314 a(n) = n*2^floor((n+1)/2). 2
 0, 2, 4, 12, 16, 40, 48, 112, 128, 288, 320, 704, 768, 1664, 1792, 3840, 4096, 8704, 9216, 19456, 20480, 43008, 45056, 94208, 98304, 204800, 212992, 442368, 458752, 950272, 983040, 2031616, 2097152, 4325376 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS G. C. Greubel, Table of n, a(n) for n = 0..1000 Simon Plouffe, Illustration Index entries for linear recurrences with constant coefficients, signature (0,4,0,-4). FORMULA From Chai Wah Wu, May 30 2016: (Start) a(n) = 4*a(n-2) - 4*a(n-4) for n > 3. G.f.: 2*x*(2*x^2 + 2*x + 1)/(2*x^2 - 1)^2. (End) E.g.f.: x*(2*cosh(sqrt(2)*x) + sqrt(2)*sinh(sqrt(2)*x)). - G. C. Greubel, May 30 2016 MAPLE seq(n*2^(floor((n+1)/2)), n=0..120); MATHEMATICA LinearRecurrence[{0, 4, 0, -4}, {0, 2, 4, 12}, 50] (* G. C. Greubel, May 30 2016 *) CROSSREFS Equals 2*A093968. Sequence in context: A225748 A114064 A071118 * A053636 A181135 A054440 Adjacent sequences:  A132311 A132312 A132313 * A132315 A132316 A132317 KEYWORD nonn AUTHOR Simon Plouffe, Nov 19 2007 STATUS approved

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Last modified February 19 10:34 EST 2019. Contains 320310 sequences. (Running on oeis4.)