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 A161909 #16 Jun 13 2015 00:53:13 %S A161909 0,0,1,-3,7,-13,23,-41,79,-161,335,-689,1391,-2769,5487,-10897,21743, %T A161909 -43537,87279,-174865,349935,-699665,1398511,-2795793,5590767, %U A161909 -11182353,22367983,-44740881,89485039,-178966801,357920495,-715821329,1431629551,-2863272209,5726596847 %N A161909 Inverse binomial transform of A181586. %C A161909 A181586(n) and successive differences: %C A161909 0, 0, 1, 0, 1, 2, %C A161909 0, 1, -1, 1, 1, 3, %C A161909 1, -2, 2, 0, 2, 0, %C A161909 -3, 4, -2, 2, -2, 6, %C A161909 7, -6, 4, -4, 8, -4, %C A161909 -13, 10, -8, 12, -12, 12. %C A161909 First column is a(n). %H A161909 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (-3,-2,2,4). %F A161909 a(n+2)=( (2*a(n)+A077950(n)) signed) %F A161909 a(n)-a(n-1) = (-1)^n*A000749(n+2). %F A161909 G.f. -x^2 / ( (x-1)*(2*x+1)*(2*x^2+2*x+1) ). - R. J. Mathar, Feb 06 2011 %K A161909 sign,easy %O A161909 0,4 %A A161909 _Paul Curtz_, Jan 31 2011