Number of distinct solutions of sum{i=1..6}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 2..n-2.
A180829
Number of distinct solutions of sum{i=1..6}(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) =7a(5) =55a(6) =715a(7) =4260a(8) =25603a(9) =102717a(10) =408766a(11) =1258601a(12) =3851049a(13) =9814876a(14) =25170369a(15) =55987636a(16) =125991305a(17) =252719186a(18) =515720550a(19) =954717615a(20) =1803406803a(21) =3129204953a(22) =5559159252a(23) =9151697254a(24) =15453087022a(25) =24346596138a(26) =39398858317
External references
- oeis: A180829