%I #3 Mar 31 2012 12:35:46
%S 0,1,18,756,18478,327338,4292145,43576141,354466005,2394458182,
%T 13770292261,69111228938,307750080438,1236998118274,4537247867399,
%U 15375840213938,48489022864504,143625325278096,401488209736317
%N Number of distinct solutions of sum{i=1..10}(x(2i-1)*x(2i)) = 0 (mod n), with x() only in 1..n-1
%C Column 10 of A180782
%H R. H. Hardin, <a href="/A180781/b180781.txt">Table of n, a(n) for n=1..183</a>
%K nonn
%O 1,3
%A _R. H. Hardin_ Sep 20 2010