Number of primitive (period n) periodic palindromes with integer entries that cover an initial interval of positive integers.

A327879

Number of primitive (period n) periodic palindromes with integer entries that cover an initial interval of positive integers.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =6a(5) =12a(6) =40a(7) =74a(8) =300a(9) =538a(10) =2598a(11) =4682a(12) =25938a(13) =47292a(14) =296488a(15) =545820a(16) =3816240a(17) =7087260a(18) =54666830a(19) =102247562a(20) =862437450a(21) =1622632496a(22) =14857095400a(23) =28091567594a(24) =277474931700a(25) =526858348368

External references