This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A143906 #9 Jan 27 2022 21:45:48 %S A143906 1001,10011001,10100101,11000011,100011110001,100101101001, %T A143906 100110011001,101001100101,101010010101,101100001101,110001100011, %U A143906 110010010011,110100001011,111000000111,1000011111100001,1000101111010001 %N A143906 a(n) is A143905(n) written in binary. %C A143906 This sequence lists all finite binary strings that are palindromes with an equal number of 0's and 1's and that each start and end with 1, listed in order of the strings' numerical values if the strings are considered to be base 2 numbers. %F A143906 Intersection of A057148 and A071925. - _R. J. Mathar_, Sep 05 2008 %Y A143906 Cf. A006995, A031443, A143905. %Y A143906 Cf. A057148, A071925. %K A143906 base,nonn %O A143906 1,1 %A A143906 _Leroy Quet_, Sep 04 2008 %E A143906 Extended by _R. J. Mathar_, Sep 05 2008 %E A143906 Corrected comment. - _Leroy Quet_, Oct 13 2008