Number of distinct values taken by 3rd derivative of x^x^...^x (with n x's and parentheses inserted in all possible ways) at x=1.
1, 1, 2, 4, 7, 11, 15, 20, 26, 32, 39, 47, 55, 64, 74, 84, 95, 107, 119, 132, 146, 160
2 seqfan posts
Thu Nov 3 18:23:40 CET 2011 [seqfan] Re: Intersections of x^x^...^x