Expansion of e.g.f.: sec(arctan(x)*exp(x))=1+1/2!*x^2+6/3!*x^3+21/4!*x^4+100/5!*x^5...

A012418

Expansion of e.g.f.: sec(arctan(x)*exp(x))=1+1/2!*x^2+6/3!*x^3+21/4!*x^4+100/5!*x^5...

Terms

    a(0) =1a(1) =0a(2) =1a(3) =6a(4) =21a(5) =100a(6) =1005a(7) =9170a(8) =73353a(9) =794952a(10) =11042745a(11) =144625118a(12) =1936131549a(13) =31475441452a(14) =562265168101

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