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 A242843 #5 May 24 2014 18:37:14
%S A242843 6,12,26,54,104,194,357,590,1012,1814,3137,5990,11400,22864,46715,
%T A242843 97788,206639,438654,930092,1969748,4147412,8696479,18137872,37638970,
%U A242843 77738200,159832004,327315948,667736364,1357690562,2751972885,5562836882,11216402410
%N A242843 Number of compositions of n with difference 3 between the number of odd parts and the number of even parts, both counted without multiplicity.
%H A242843 Alois P. Heinz, <a href="/A242843/b242843.txt">Table of n, a(n) for n = 9..500</a>
%e A242843 a(9) = 6 = 3!: all permutations of {1,3,5}.
%Y A242843 Column k=3 of A242626.
%K A242843 nonn
%O A242843 9,1
%A A242843 _Alois P. Heinz_, May 23 2014