Let S denote the palindromes in the language {0,1,2,...,n-1}*; a(n) = number of words of length 4 in the language SS.

A187277

Let S denote the palindromes in the language {0,1,2,...,n-1}*; a(n) = number of words of length 4 in the language SS.

Terms

    a(0) =1a(1) =16a(2) =57a(3) =136a(4) =265a(5) =456a(6) =721a(7) =1072a(8) =1521a(9) =2080a(10) =2761a(11) =3576a(12) =4537a(13) =5656a(14) =6945a(15) =8416a(16) =10081a(17) =11952a(18) =14041a(19) =16360a(20) =18921a(21) =21736a(22) =24817a(23) =28176a(24) =31825a(25) =35776a(26) =40041a(27) =44632a(28) =49561a(29) =54840

External references