Number of closed paths of length n whose steps are 18th roots of unity, U_18(n).

A198802

Number of closed paths of length n whose steps are 18th roots of unity, U_18(n).

Terms

    a(0) =1a(1) =0a(2) =18a(3) =36a(4) =918a(5) =5400a(6) =82800a(7) =801360a(8) =10907190a(9) =132053040a(10) =1802041668a(11) =24199809480a(12) =340640607384

External references