Let S denote the palindromes in the language {0,1,2,3,4}*; a(n) = number of words of length n in the language SS.

A007058

Let S denote the palindromes in the language {0,1,2,3,4}*; a(n) = number of words of length n in the language SS.

Terms

    a(0) =1a(1) =5a(2) =25a(3) =65a(4) =265a(5) =605a(6) =2125a(7) =4345a(8) =14665a(9) =27965a(10) =93025a(11) =171825a(12) =559645a(13) =1015565a(14) =3276725a(15) =5857865a(16) =18734665a(17) =33203045a(18) =105436225a(19) =185546785a(20) =585842065a(21) =1025381485a(22) =3222484125a(23) =5615234265a(24) =17577530845a(25) =30517575605a(26) =95213827825a(27) =164794865465a(28) =512692025285a(29) =885009765485

External references