n-th derivative of x^((x^x)^x) at x=1.

Terms

a(0) =1a(1) =1a(2) =2a(3) =15a(4) =80a(5) =590a(6) =5034a(7) =47110a(8) =511216a(9) =6019416a(10) =77899320a(11) =1092871824a(12) =16459538952a(13) =265695302808