Palindromic mountain numbers.

Terms

a(0) =1a(1) =121a(2) =131a(3) =141a(4) =151a(5) =161a(6) =171a(7) =181a(8) =191a(9) =12321a(10) =12421a(11) =12521a(12) =12621a(13) =12721a(14) =12821a(15) =12921a(16) =13431a(17) =13531a(18) =13631a(19) =13731a(20) =13831a(21) =13931a(22) =14541a(23) =14641a(24) =14741a(25) =14841a(26) =14941a(27) =15651a(28) =15751a(29) =15851