Number of distinct values taken by 8^8^...^8 (with n 8's and parentheses inserted in all possible ways).

A145548

Number of distinct values taken by 8^8^...^8 (with n 8's and parentheses inserted in all possible ways).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =9a(5) =20a(6) =48a(7) =115a(8) =286a(9) =719a(10) =1842a(11) =4765a(12) =12482a(13) =32957a(14) =87756a(15) =235198a(16) =634261a(17) =1719312a(18) =4682952a(19) =12808650a(20) =35168306a(21) =96893138a(22) =267794711a(23) =742260014a(24) =2062792103

External references