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 A130869 #4 Mar 30 2012 18:51:52 %S A130869 2,7,16,32,63,126,254,511,1024,2048,4095,8190,16382,32767,65536, %T A130869 131072,262143,524286,1048574,2097151,4194304,8388608,16777215, %U A130869 33554430,67108862,134217727,268435456,536870912,1073741823,2147483646 %N A130869 Partial sums of A130752. %F A130869 O.g.f.: (2-x)/[(1-x)(1-2x)(1-x+x^2)]. - _R. J. Mathar_, Jul 04 2008 %F A130869 Inverse binomial transform yields 2,(5,4,3) periodically continued with period 3. - _R. J. Mathar_, Jul 04 2008 %F A130869 a(n+1)-2a(n) = A131290(n+1). 2^(n+2)-a(n) = A131026(n+2). %K A130869 nonn %O A130869 0,1 %A A130869 _Paul Curtz_, Jul 24 2007 %E A130869 Edited and extended by _R. J. Mathar_, Jul 04 2008