Number of palindromes of length n (in base 6).

Terms

a(0) =5a(1) =5a(2) =30a(3) =30a(4) =180a(5) =180a(6) =1080a(7) =1080a(8) =6480a(9) =6480a(10) =38880a(11) =38880a(12) =233280a(13) =233280a(14) =1399680a(15) =1399680a(16) =8398080a(17) =8398080a(18) =50388480a(19) =50388480a(20) =302330880a(21) =302330880a(22) =1813985280a(23) =1813985280a(24) =10883911680a(25) =10883911680a(26) =65303470080a(27) =65303470080a(28) =391820820480a(29) =391820820480