Number of ternary words of length n in which all digits 0..2 occur in every 6 consecutive digits.

A249019

Number of ternary words of length n in which all digits 0..2 occur in every 6 consecutive digits.

Terms

    a(0) =1a(1) =3a(2) =9a(3) =27a(4) =81a(5) =243a(6) =540a(7) =1440a(8) =3804a(9) =9960a(10) =25908a(11) =67344a(12) =175884a(13) =458832a(14) =1196364a(15) =3119304a(16) =8134164a(17) =21212832a(18) =55316892a(19) =144249168a(20) =376159644a(21) =980918904a(22) =2557958964a(23) =6670420704a(24) =17394543180a(25) =45359994336a(26) =118285895244a(27) =308455762488a(28) =804364332180

External references