Number of palindromes that use nonzero digits and have a digit sum of n.

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =4a(5) =8a(6) =8a(7) =16a(8) =16a(9) =31a(10) =31a(11) =62a(12) =62a(13) =124a(14) =124a(15) =248a(16) =248a(17) =496a(18) =496a(19) =991a(20) =991a(21) =1980a(22) =1980a(23) =3956a(24) =3956a(25) =7904a(26) =7904a(27) =15792a(28) =15792a(29) =31553