A180788 Number of distinct solutions of sum{i=1..6}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 1..n-1.

0, 0, 9, 112, 1004, 6404, 32890, 137528, 499641, 1579113, 4551268, 11861187, 29034355, 65777365, 142805210, 291148080, 576393509, 1082580072, 1993354411, 3505999065, 6088877416, 10148269838, 16796812567, 26776385524, 42563703291

Offset: 1

Author

R. H. Hardin Sep 20 2010

Keywords

• nonn

Comments

Column 6 of A180793

Examples

			Solutions for sum of products of 6 1..2 pairs = 1 (mod 3) are
(1*1 + 1*1 + 1*1 + 1*1 + 1*1 + 1*2) (1*1 + 1*1 + 1*1 + 1*1 + 1*2 + 2*2)
(1*1 + 1*1 + 1*1 + 1*2 + 2*2 + 2*2) (1*1 + 1*1 + 1*2 + 1*2 + 1*2 + 1*2)
(1*1 + 1*1 + 1*2 + 2*2 + 2*2 + 2*2) (1*1 + 1*2 + 1*2 + 1*2 + 1*2 + 2*2)
(1*1 + 1*2 + 2*2 + 2*2 + 2*2 + 2*2) (1*2 + 1*2 + 1*2 + 1*2 + 2*2 + 2*2)
(1*2 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2)
		

Links

• R. H. Hardin, Table of n, a(n) for n=1..183