Number of distinct solutions of sum{i=1..3}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 2..n-2.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =2a(5) =5a(6) =30a(7) =69a(8) =197a(9) =311a(10) =772a(11) =1108a(12) =2260a(13) =2939a(14) =5428a(15) =6860a(16) =11681a(17) =13562a(18) =22572a(19) =25991a(20) =39771a(21) =44766a(22) =68086a(23) =73210a(24) =109117a(25) =116321a(26) =164828a(27) =177996a(28) =250708a(29) =252738