Vertically symmetric numbers.

Terms

a(0) =0a(1) =1a(2) =8a(3) =11a(4) =25a(5) =52a(6) =88a(7) =101a(8) =111a(9) =181a(10) =205a(11) =215a(12) =285a(13) =502a(14) =512a(15) =582a(16) =808a(17) =818a(18) =888a(19) =1001a(20) =1111a(21) =1251a(22) =1521a(23) =1881a(24) =2005a(25) =2115a(26) =2255a(27) =2525a(28) =2885a(29) =5002