k th digit of a(n) = number of different digits within 2 places of k (not including k).

Terms

a(0) =11a(1) =111a(2) =122a(3) =212a(4) =221a(5) =1111a(6) =1221a(7) =2122a(8) =2212a(9) =11111a(10) =12212a(11) =12221a(12) =13322a(13) =21221a(14) =22122a(15) =22331a(16) =111111a(17) =122122a(18) =122212a(19) =122221a(20) =212212a(21) =212221a(22) =221221a(23) =1111111a(24) =1221221a(25) =1222122a(26) =1222212a(27) =2122122a(28) =2122212a(29) =2122221