exp(arctanh(x)+tan(x))=1+2*x+4/2!*x^2+12/3!*x^3+48/4!*x^4+232/5!*x^5...

A013172

exp(arctanh(x)+tan(x))=1+2*x+4/2!*x^2+12/3!*x^3+48/4!*x^4+232/5!*x^5...

Terms

    a(0) =1a(1) =2a(2) =4a(3) =12a(4) =48a(5) =232a(6) =1344a(7) =8960a(8) =68096a(9) =580480a(10) =5489024a(11) =57192960a(12) =649853952a(13) =8028368896a(14) =106867367936

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