Array T(n,k) counting words with n letters drawn from a k-letter alphabet with no letter appearing thrice in a 3-letter subword.

A265584

Array T(n,k) counting words with n letters drawn from a k-letter alphabet with no letter appearing thrice in a 3-letter subword.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =0a(4) =4a(5) =3a(6) =0a(7) =6a(8) =9a(9) =4a(10) =0a(11) =10a(12) =24a(13) =16a(14) =5a(15) =0a(16) =16a(17) =66a(18) =60a(19) =25a(20) =6a(21) =0a(22) =26a(23) =180a(24) =228a(25) =120a(26) =36a(27) =7a(28) =0a(29) =42

External references