Expansion of e.g.f.: exp(sech(x)*arcsinh(x))=1+x+1/2!*x^2-3/3!*x^3-15/4!*x^4+5/5!*x^5...

A012881

Expansion of e.g.f.: exp(sech(x)*arcsinh(x))=1+x+1/2!*x^2-3/3!*x^3-15/4!*x^4+5/5!*x^5...

Terms

    a(0) =1a(1) =1a(2) =1a(3) =-3a(4) =-15a(5) =5a(6) =345a(7) =889a(8) =-11263a(9) =-82167a(10) =455025a(11) =7869301a(12) =-16466703a(13) =-906141171a(14) =-746021367a(15) =128450716913a(16) =480286325633

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