%I A145548
%S A145548 1,1,2,4,9,20,48,115,286,719,1842,4765,12482,32957,87756,235198,634261,
%T A145548 1719312,4682952,12808650,35168306,96893138,267794711,742260014,
%U A145548 2062792103
%N A145548 Number of distinct values taken by 8^8^...^8 (with n 8's and parentheses 
               inserted in all possible ways).
%D A145548 R. K. Guy and J. L. Selfridge, The nesting and roosting habits of the 
               laddered parenthesis. Amer. Math. Monthly 80 (1973), 868-876.
%H A145548 <a href="Sindx_Par.html#parens">Index entries for sequences related to 
               parenthesizing</a>
%Y A145548 Cf. A002845, A003018, A003019, A145545, A145546, A145547, A145549, A145550, 
               A000081.
%Y A145548 Sequence in context: A034826 A145547 A123467 this_sequence A145549 A145550 
               A000081
%Y A145548 Adjacent sequences: A145545 A145546 A145547 this_sequence A145549 A145550 
               A145551
%K A145548 more,nonn
%O A145548 1,3
%A A145548 Jon E. Schoenfield (jonscho(AT)hiwaay.net), Oct 13 2008