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 A055161 #4 Mar 30 2012 18:51:25 %S A055161 954,7641,995544,766431,76664331,98754210,987654321,999555444, %T A055161 7666643331,9876543210,9987542100,98766543321,766666433331, %U A055161 987665433210,998765432100,999875421000,999955554444,9876665433321 %N A055161 n has digits in descending order and n=a+b where a has the digits of n in another order and b has the digits of n in ascending order (perhaps with leading zeros). %D A055161 Denis Borris, Ken Duisenberg's Puzzle of the Week, April 20, 2000 %H A055161 <a href="http://www.ecst.csuchico.edu/~kend/potw/archive/000420sol.html">Source</a> %F A055161 a(n)= A055160(n)+A055162(n) %e A055161 954=495+459 %Y A055161 Cf. A055158. %K A055161 base,nonn %O A055161 0,1 %A A055161 _Henry Bottomley_, Apr 27 2000