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 A128056 Hankel transform of A128057. 5
 1, -3, -6, 28, 56, -288, -576, 3008, 6016, -31488, -62976, 329728, 659456, -3452928, -6905856, 36159488, 72318976, -378667008, -757334016, 3965452288, 7930904576, -41526755328, -83053510656, 434873827328 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS a(n)=2^A128054(n)*A128053(n). Hankel transform of A128058. LINKS Table of n, a(n) for n=0..23. FORMULA a(n)=A128055(n)*((cos(pi*n/2)-sin(pi*n/2))((F(n-1)+F(n+1))(5/6-cos(pi*n/3)/3)(1+(-1)^n)/2 +(F(n)+F(n+2))(5/6-cos(pi*(n+1)/3)/3)(1-(-1)^n)/2)). Empirical g.f.: -(2*x-1)*(4*x^2-x+1) / (16*x^4+12*x^2+1). - Colin Barker, Jun 27 2013 CROSSREFS Sequence in context: A076711 A075088 A102428 * A068808 A068133 A370668 Adjacent sequences: A128053 A128054 A128055 * A128057 A128058 A128059 KEYWORD easy,sign AUTHOR Paul Barry, Feb 13 2007 STATUS approved

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Last modified September 18 21:47 EDT 2024. Contains 376002 sequences. (Running on oeis4.)