exp(arctan(x)*tan(x))=1+2/2!*x^2+12/4!*x^4+280/6!*x^6+7952/8!*x^8...

A012444

exp(arctan(x)*tan(x))=1+2/2!*x^2+12/4!*x^4+280/6!*x^6+7952/8!*x^8...

Terms

    a(0) =1a(1) =2a(2) =12a(3) =280a(4) =7952a(5) =532768a(6) =30306496a(7) =4657640832a(8) =327222722816

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