Number of palindromes of length n and containing the digit 1 (or any other fixed nonzero digit).

A050686

Number of palindromes of length n and containing the digit 1 (or any other fixed nonzero digit).

Terms

    a(0) =1a(1) =1a(2) =18a(3) =18a(4) =252a(5) =252a(6) =3168a(7) =3168a(8) =37512a(9) =37512a(10) =427608a(11) =427608a(12) =4748472a(13) =4748472a(14) =51736248a(15) =51736248a(16) =555626232a(17) =555626232a(18) =5900636088a(19) =5900636088a(20) =62105724792a(21) =62105724792a(22) =648951523128a(23) =648951523128

External references