Number of distinct solutions of sum{i=1..5}(x(2i-1)*x(2i)) = 0 (mod n), with x() only in 1..n-1.
A180776
Number of distinct solutions of sum{i=1..5}(x(2i-1)*x(2i)) = 0 (mod n), with x() only in 1..n-1.
Terms
- a(0) =0a(1) =0a(2) =7a(3) =62a(4) =402a(5) =1960a(6) =7587a(7) =25470a(8) =73146a(9) =193036a(10) =455161a(11) =1022770a(12) =2098782a(13) =4196208a(14) =7797217a(15) =14286908a(16) =24527232a(17) =42125055a(18) =67955391a(19) =110571248a(20) =170260213a(21) =264585538a(22) =390623343a(23) =588725404a(24) =837466268a(25) =1220597598a(26) =1696535256
External references
- oeis: A180776