A180792 - OEIS

A180792

Number of distinct solutions of sum{i=1..10}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 1..n-1

%I #3 Mar 31 2012 12:35:46

%S 0,0,26,744,18475,326446,4292149,43506488,354466019,2391684440,

%T 13770292256,69044240450,307750080388,1235903232638,4537248102720,

%U 15362780912768,48489022864600,143504551536641,401488209735955

%N Number of distinct solutions of sum{i=1..10}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 1..n-1

%C Column 10 of A180793

%H R. H. Hardin, <a href="/A180792/b180792.txt">Table of n, a(n) for n=1..183</a>

%K nonn

%O 1,3

%A _R. H. Hardin_ Sep 20 2010