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 A009743 Expansion of e.g.f. tan(x)*sin(tanh(x)), even powers only. 2
 0, 2, -4, 198, -4040, 316874, -19176268, 2374489614, -282825044624, 52279148694674, -10130169154611604, 2647521503418566742, -750173159912329738328, 264926794785670147533914, -102608322417098838227114716, 47204299500814419684790058910 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS G. C. Greubel, Table of n, a(n) for n = 0..239 MATHEMATICA With[{nn=30}, Take[CoefficientList[Series[Tan[x]*Sin[Tanh[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, May 28 2016 *) PROG (PARI) x='x+O('x^50); v=Vec(serlaplace(tan(x)*sin(tanh(x)))); concat([0], vector(#v\2, n, v[2*n-1])) \\ G. C. Greubel, Mar 04 2018 CROSSREFS Sequence in context: A307556 A018637 A018647 * A009796 A018651 A068479 Adjacent sequences: A009740 A009741 A009742 * A009744 A009745 A009746 KEYWORD sign AUTHOR R. H. Hardin EXTENSIONS Extended with signs by Olivier Gérard, Mar 15 1997 More terms from and prior Mathematica program removed by Harvey P. Dale, May 28 2016 STATUS approved

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Last modified September 19 10:42 EDT 2024. Contains 376008 sequences. (Running on oeis4.)