E.g.f.: sec(tanh(x)*log(x+1))=1+12/4!*x^4-60/5!*x^5+90/6!*x^6-420/7!*x^7...

A012657

E.g.f.: sec(tanh(x)*log(x+1))=1+12/4!*x^4-60/5!*x^5+90/6!*x^6-420/7!*x^7...

Terms

    a(0) =1a(1) =0a(2) =0a(3) =0a(4) =12a(5) =-60a(6) =90a(7) =-420a(8) =19040a(9) =-245952a(10) =1660680a(11) =-12025200a(12) =266431176a(13) =-5435780064a(14) =74009711776a(15) =-910402889760

External references