Let S denote the palindromes in the language {0,1,2,3}*; a(n) = number of words of length n in the language SS.
A007057
Let S denote the palindromes in the language {0,1,2,3}*; a(n) = number of words of length n in the language SS.
Terms
- a(0) =1a(1) =4a(2) =16a(3) =40a(4) =136a(5) =304a(6) =880a(7) =1768a(8) =4936a(9) =9112a(10) =25216a(11) =45016a(12) =121600a(13) =212944a(14) =571552a(15) =982240a(16) =2616136a(17) =4456384a(18) =11785408a(19) =19922872a(20) =52402336a(21) =88076560a(22) =230641504a(23) =385875880a(24) =1006499200a(25) =1677720304a(26) =4361862976a(27) =7247738776a(28) =18789905872a(29) =31138512784
External references
- oeis: A007057