14572944domain: NAppears in sequencesn-th derivative of x^(x^((x^x)^x)) at x=1.at n=9A215629Ninth derivative of f_n at x=1, where f_n is the n-th of all functions that are representable as x^x^...^x with m>=1 x's and parentheses inserted in all possible ways.at n=15A215839