Number of distinct solutions of sum{i=1..5}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 1..n-1.
A180787
Number of distinct solutions of sum{i=1..5}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 1..n-1.
Terms
- a(0) =0a(1) =1a(2) =5a(3) =64a(4) =400a(5) =1914a(6) =7589a(7) =24902a(8) =73134a(9) =188315a(10) =455127a(11) =996083a(12) =2098908a(13) =4080930a(14) =7790731a(15) =13869018a(16) =24527424a(17) =40768032a(18) =67955336a(19) =106952861a(20) =169909977a(21) =255608028a(22) =390623704a(23) =566247614a(24) =837326375a(25) =1175991196a(26) =1690928973
External references
- oeis: A180787