Number of length-7 0..k arrays connected end-around, with no sequence of L<n elements immediately followed by itself (periodic "squarefree").

A215230

Number of length-7 0..k arrays connected end-around, with no sequence of L<n elements immediately followed by itself (periodic "squarefree").

Terms

    a(0) =0a(1) =0a(2) =840a(3) =10080a(4) =57960a(5) =228480a(6) =710640a(7) =1874880a(8) =4379760a(9) =9313920a(10) =18378360a(11) =34114080a(12) =60180120a(13) =101687040a(14) =165590880a(15) =261152640a(16) =400468320a(17) =599074560a(18) =876634920a(19) =1257711840a(20) =1772629320a(21) =2458431360a(22) =3359941200a(23) =4530926400

External references