642299748231domain: NAppears in sequencesExpansion of log(1+log(1+x)*cosh(x)).at n=13A009320log(sech(x)+log(x+1)) = x - 3/2!*x^2 + 10/3!*x^3 - 51/4!*x^4 + 373/5!*x^5 + ...at n=13A013201