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 A146321 #10 Jun 13 2015 00:52:43 %S A146321 1,4,-2,1,-5,16,-35,67,-128,253,-509,1024,-2051,4099,-8192,16381, %T A146321 -32765,65536,-131075,262147,-524288,1048573,-2097149,4194304, %U A146321 -8388611,16777219,-33554432,67108861,-134217725,268435456 %N A146321 Inverse binomial transform of A070366. %H A146321 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (-3,-3,-2). %F A146321 G.f.: 1+ x*( 4+10*x+7*x^2 ) / ( (2*x+1)*(1+x+x^2) ). - R. J. Mathar, Oct 26 2011 %K A146321 sign %O A146321 0,2 %A A146321 _Paul Curtz_, Oct 30 2008 %E A146321 Edited by _N. J. A. Sloane_, Jan 04 2009