This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A145548 #8 Oct 05 2017 02:53:46 %S A145548 1,1,2,4,9,20,48,115,286,719,1842,4765,12482,32957,87756,235198, %T A145548 634261,1719312,4682952,12808650,35168306,96893138,267794711, %U A145548 742260014,2062792103 %N A145548 Number of distinct values taken by 8^8^...^8 (with n 8's and parentheses inserted in all possible ways). %H A145548 R. K. Guy and J. L. Selfridge, <a href="http://www.jstor.org/stable/2319392">The nesting and roosting habits of the laddered parenthesis</a>, Amer. Math. Monthly 80 (8) (1973), 868-876. %H A145548 <a href="/index/Par#parens">Index entries for sequences related to parenthesizing</a> %Y A145548 Cf. A002845, A003018, A003019, A145545, A145546, A145547, A145549, A145550, A000081. %K A145548 more,nonn %O A145548 1,3 %A A145548 _Jon E. Schoenfield_, Oct 13 2008