Coefficient of [x^(4*n+2)] in expansion of e.g.f. tanh(cos(x) - cosh(x)).

A013477

Coefficient of [x^(4*n+2)] in expansion of e.g.f. tanh(cos(x) - cosh(x)).

Terms

    a(0) =-2a(1) =238a(2) =-473762a(3) =4544139598

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