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 A161921 #8 Sep 02 2013 14:42:17
%S A161921 0,0,0,1,2,3,7,11,17,28,43,63,96,139,199,287,406,566,792,1092,1496,
%T A161921 2045,2772,3733,5016,6696,8897,11784,15534,20391,26692,34797,45207,
%U A161921 58564,75614,97328,124953,159945,204185,260025,330286,418506,529106,667380,839938
%N A161921 The bisection A053445(2n+1).
%H A161921 Nathaniel Johnston, <a href="/A161921/b161921.txt">Table of n, a(n) for n = 0..2500</a>
%t A161921 Take[Differences[Table[PartitionsP[n],{n,0,100}],2],{2,-1,2}] (* _Harvey P. Dale_, Sep 02 2013 *)
%Y A161921 Cf. A160644 (the other bisection), A160643 (first differences of a(n)).
%K A161921 easy,nonn
%O A161921 0,5
%A A161921 _Alford Arnold_, Jul 05 2009