Number of distinct solutions of sum{i=1..7}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 2..n-2.
A180830
Number of distinct solutions of sum{i=1..7}(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) =4a(5) =98a(6) =1634a(7) =13191a(8) =98721a(9) =509796a(10) =2452572a(11) =9324188a(12) =33559304a(13) =102516038a(14) =302010701a(15) =786309831a(16) =1997861579a(17) =4607230060a(18) =10461759080a(19) =21941200490a(20) =45604744028a(21) =88621893721a(22) =171539771106a(23) =313255557883a(24) =571763758062
External references
- oeis: A180830