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 A135634 #2 Mar 30 2012 17:33:53 %S A135634 2,22,272,2772,27172,271172,2718172,27188172,271828172,2718228172, %T A135634 27182828172,271828828172,2718281828172,27182811828172, %U A135634 271828181828172,2718281881828172,27182818281828172,271828182281828172 %N A135634 Palindromes formed from the reflected decimal expansion of e. %C A135634 e = 2.71828182845904523536028747135... (See A001113). %C A135634 The number of digits of a(n) is equal to n. %e A135634 n ... Successive digits of a(n) %e A135634 1 ............ ( 2 ) %e A135634 2 ........... ( 2 2 ) %e A135634 3 .......... ( 2 7 2 ) %e A135634 4 ......... ( 2 7 7 2 ) %e A135634 5 ........ ( 2 7 1 7 2 ) %e A135634 6 ....... ( 2 7 1 1 7 2 ) %e A135634 7 ...... ( 2 7 1 8 1 7 2 ) %e A135634 8 ..... ( 2 7 1 8 8 1 7 2 ) %e A135634 9 .... ( 2 7 1 8 2 8 1 7 2 ) %e A135634 10 .. ( 2 7 1 8 2 2 8 1 7 2 ) %Y A135634 Cf. A001113, A002113. %Y A135634 Cf. A138068, A138069. %K A135634 base,nonn %O A135634 1,1 %A A135634 _Omar E. Pol_, Mar 01 2008, Mar 28 2008