Expansion of e.g.f.: sech(arctan(x)+log(x+1))=1-4/2!*x^2+6/3!*x^3+77/4!*x^4-340/5!*x^5...

A012971

Expansion of e.g.f.: sech(arctan(x)+log(x+1))=1-4/2!*x^2+6/3!*x^3+77/4!*x^4-340/5!*x^5...

Terms

    a(0) =1a(1) =0a(2) =-4a(3) =6a(4) =77a(5) =-340a(6) =-3670a(7) =34230a(8) =303425a(9) =-5406840a(10) =-35315200a(11) =1225800950a(12) =4445446925a(13) =-374586782700a(14) =9072379550

External references