-260064domain: ZAppears in sequencessec(arcsinh(x)*log(x+1))=1+12/4!*x^4-60/5!*x^5+210/6!*x^6-1260/7!*x^7...at n=9A012582A triangular sequence of coefficients from a three level exponential expansion function: f(x,t) = log(1 + t)*(1 - t)*exp(x*(t - t^2)).at n=40A137455