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 A242837 #7 May 24 2014 18:53:37
%S A242837 24,0,84,0,288,0,822,0,2226,0,5304,720,15034,10680,55624,84360,265200,
%T A242837 527640,1342608,2886960,6673176,14433240,31725930,67718568,144265370,
%U A242837 302771208,631156708,1303769496,2673673704,5447789784,11028089996,22211684328,44491303391
%N A242837 Number of compositions of n with difference -4 between the number of odd parts and the number of even parts, both counted without multiplicity.
%C A242837 First odd term is a(52) = 44491303391.
%H A242837 Alois P. Heinz, <a href="/A242837/b242837.txt">Table of n, a(n) for n = 20..500</a>
%e A242837 a(20) = 24 = 4!: all permutations of {2,4,6,8}.
%Y A242837 Column k=-4 of A242626.
%K A242837 nonn
%O A242837 20,1
%A A242837 _Alois P. Heinz_, May 23 2014