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 A110061 #8 Nov 04 2021 13:09:24
%S A110061 0,0,-3,4,0,-3,7,-4,-3,10,-11,1,13,-21,12,12,-34,33,0,-46,67,-33,-46,
%T A110061 113,-100,-13,159,-213,87,172,-372,300,85,-544,672,-215,-629,1216,
%U A110061 -887,-414,1845,-2103,473,2259,-3948,2576,1786,-6207,6524,-790,-7993,12731,-7314,-7203,20724,-20045,111,27927,-40769,20156
%N A110061 Expansion of x^2*(-3+4*x)/(1-x^3+x^4).
%C A110061 One of several sequences which appear to "spiral outwards" when plotted against each other (see A110062-64).
%H A110061 Robert Munafo, <a href="http://www.mrob.com/pub/math/seq-floretion.html">Sequences Related to Floretions</a>
%H A110061 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,1,-1).
%p A110061 seriestolist(series(x^2*(-3+4*x)/(1-x^3+x^4), x=0,30)); -or- 4tesseq[A*B] with A = + .5'i + .5'j + .5'k + .5e and B = - .5'i - .25'j + .25'k - .5i' - .25j' + .25k' - .5'ii' - .25'ij' - .25'ik' - .25'ji' - .25'ki' - .5e
%t A110061 CoefficientList[Series[x^2(-3+4x)/(1-x^3+x^4),{x,0,100}],x] (* or *) LinearRecurrence[{0,0,1,-1},{0,0,-3,4},100] (* _Harvey P. Dale_, Nov 04 2021 *)
%Y A110061 Cf. A110062, A110063, A110064.
%K A110061 easy,sign
%O A110061 0,3
%A A110061 _Creighton Dement_, Jul 10 2005