Number of length-6 0..k arrays connected end-around, with no sequence of L<n elements immediately followed by itself (periodic "squarefree").

A215229

Number of length-6 0..k arrays connected end-around, with no sequence of L<n elements immediately followed by itself (periodic "squarefree").

Terms

    a(0) =0a(1) =18a(2) =408a(3) =2940a(4) =12600a(5) =40110a(6) =105168a(7) =240408a(8) =496080a(9) =945450a(10) =1690920a(11) =2870868a(12) =4667208a(13) =7313670a(14) =11104800a(15) =16405680a(16) =23662368a(17) =33413058a(18) =46299960a(19) =63081900a(20) =84647640a(21) =112029918a(22) =146420208a(23) =189184200a(24) =241878000a(25) =306265050a(26) =384333768

External references