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 A178051 #7 Mar 21 2013 13:25:48
%S A178051 1,2,3,4,5,6,7,8,9,3,4,5,6,7,8,9,3,4,5,6,7,8,9,4,4,5,6,7,8,9,5,5,5,6,
%T A178051 7,8,9,6,6,6,6,7,8,9,7,7,7,7,7,8,9,8,8,8,8,8,8,9,9,9,9,9,9,9,9,3,4,5,
%U A178051 6,7,8,9,4,4,5,6,7,8,9,5,5,5,6,7,8,9,6,6,6,6,7,8,9,7,7,7,7,7,8,9,8,8,8,8,8
%N A178051 Peak values of mountain numbers (cf. A134941).
%C A178051 a(n) = A054055(A134941(n)).
%H A178051 R. Zumkeller, <a href="/A178051/b178051.txt">Table of n, a(n) for n = 1..21846</a> (full sequence)
%e A178051 A134941(552)=134941 --> a(552) = MAX{1,3,4,9} = 9.
%K A178051 base,fini,full,nonn
%O A178051 1,2
%A A178051 _Reinhard Zumkeller_, May 25 2010