tanh(arctan(x)*arcsin(x))=2/2!*x^2-4/4!*x^4-82/6!*x^6+3096/8!*x^8...

A012439

tanh(arctan(x)*arcsin(x))=2/2!*x^2-4/4!*x^4-82/6!*x^6+3096/8!*x^8...

Terms

    a(0) =2a(1) =-4a(2) =-82a(3) =3096a(4) =14202a(5) =-4057260a(6) =614585190a(7) =65252737200

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