E.g.f.: log(sech(x)+sinh(x))=x-2/2!*x^2+6/3!*x^3-20/4!*x^4+120/5!*x^5...

A013206

E.g.f.: log(sech(x)+sinh(x))=x-2/2!*x^2+6/3!*x^3-20/4!*x^4+120/5!*x^5...

Terms

    a(0) =0a(1) =1a(2) =-2a(3) =6a(4) =-20a(5) =120a(6) =-872a(7) =7056a(8) =-68000a(9) =758400a(10) =-9460352a(11) =130918656a(12) =-1995073280a(13) =33173038080a(14) =-597457144832

External references