tan(tanh(x)+arctan(x))=2*x+12/3!*x^3+232/5!*x^5+9184/7!*x^7...

A013143

tan(tanh(x)+arctan(x))=2*x+12/3!*x^3+232/5!*x^5+9184/7!*x^7...

Terms

    a(0) =2a(1) =12a(2) =232a(3) =9184a(4) =628864a(5) =65666304a(6) =9724490752

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