Expansion of e.g.f.: sech(log(x+1)-arctan(x))=1-3/4!*x^4+40/5!*x^5-250/6!*x^6+840/7!*x^7...

A013257

Expansion of e.g.f.: sech(log(x+1)-arctan(x))=1-3/4!*x^4+40/5!*x^5-250/6!*x^6+840/7!*x^7...

Terms

    a(0) =1a(1) =0a(2) =0a(3) =0a(4) =-3a(5) =40a(6) =-250a(7) =840a(8) =-4095a(9) =66960a(10) =-470700a(11) =-2908400a(12) =57705725a(13) =17230200a(14) =273271050a(15) =-194550993000

External references