Sum of n-th derivatives at x=1 of all functions that are representable as x^x^...^x with n x's and parentheses inserted in all possible ways.

A216281

Sum of n-th derivatives at x=1 of all functions that are representable as x^x^...^x with n x's and parentheses inserted in all possible ways.

Terms

    a(0) =1a(1) =2a(2) =21a(3) =392a(4) =11980a(5) =471966a(6) =24655820a(7) =1548264752a(8) =118039822488

External references