Number of palindromes of length n (in base 8).

Terms

a(0) =7a(1) =7a(2) =56a(3) =56a(4) =448a(5) =448a(6) =3584a(7) =3584a(8) =28672a(9) =28672a(10) =229376a(11) =229376a(12) =1835008a(13) =1835008a(14) =14680064a(15) =14680064a(16) =117440512a(17) =117440512a(18) =939524096a(19) =939524096a(20) =7516192768a(21) =7516192768a(22) =60129542144a(23) =60129542144a(24) =481036337152a(25) =481036337152