Number of palindromes of length n (in base 7).

Terms

a(0) =6a(1) =6a(2) =42a(3) =42a(4) =294a(5) =294a(6) =2058a(7) =2058a(8) =14406a(9) =14406a(10) =100842a(11) =100842a(12) =705894a(13) =705894a(14) =4941258a(15) =4941258a(16) =34588806a(17) =34588806a(18) =242121642a(19) =242121642a(20) =1694851494a(21) =1694851494a(22) =11863960458a(23) =11863960458a(24) =83047723206a(25) =83047723206a(26) =581334062442a(27) =581334062442