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%I #4 Mar 31 2012 12:35:42
%S 1,2,5,5,13,17,17,20,29,36,37,37,37,37,41,45,45,56,56,58,58,58,62,62,
%T 62,62,77,77,81,81,88,89,89,89,89,89,89,89,89,89,106,106,107,107,109,
%U 113,120,121,125,125,125,125,128,128,128,132,132,132,132,144,145,148,148,148
%N Length of shortest series s(1..a(n))>0, with s(1)=1 and |s(i+1)-s(i)|=i and no value s(i) repeated, containing all the values 1..n
%C A series of finite versions of an infinite problem suggested on the Sequence Fans Mailing List
%H R. H. Hardin, <a href="/A176168/b176168.txt">Table of n, a(n) for n=1..80</a>
%H R. H. Hardin, <a href="/A176168/a176168.txt">Shortest series s(1..a(n)), n=1..80</a>
%e a(5)=13 because the shortest series s() containing 1..5 is: 1 2 4 7 3 8 14 21 29 38 28 17 5
%Y For encoded series see A176169
%K nonn
%O 1,2
%A _R. H. Hardin_ Apr 10 2010
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