6251899104domain: NAppears in sequencesn-th derivative of (x^x)^((x^x)^x) at x=1.at n=11A215709n-th derivative of f_{n+1} at x=1, where f_k is the k-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=11A306739