Number of distinct solutions of sum{i=1..8}(x(2i-1)*x(2i)) = 0 (mod n), with x() only in 2..n-2.
A180820
Number of distinct solutions of sum{i=1..8}(x(2i-1)*x(2i)) = 0 (mod n), with x() only in 2..n-2.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =5a(5) =267a(6) =3470a(7) =43311a(8) =345834a(9) =2444098a(10) =13182592a(11) =64230756a(12) =260084531a(13) =976064810a(14) =3209275269a(15) =9963090038a(16) =27970062442a(17) =75278021479a(18) =187003944842a(19) =450006340740
External references
- oeis: A180820