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 A111666 #15 Mar 09 2024 15:50:13
%S A111666 2,3,4,5,10,27,68,173,450,1179,3084,8069,21122,55299,144772,379013,
%T A111666 992266,2597787,6801092,17805485,46615362,122040603,319506444,
%U A111666 836478725,2189929730,5733310467,15010001668,39296694533,102880081930
%N A111666 Expansion of (-2+3*x+3*x^2+4*x^3+3*x^4-5*x^5)/((x-1)*(x+1)*(1+x^2)*(x^2-3*x+1)).
%C A111666 Floretion Algebra Multiplication Program, FAMP Code: vessumseq[ + .25'i + .25i' + .25'ii' + .25'jj' + .25'kk' + .25'jk' + .25'kj' + .25e], sumtype: Y[15],inty[ * ]
%H A111666 Harvey P. Dale, <a href="/A111666/b111666.txt">Table of n, a(n) for n = 0..1000</a>
%H A111666 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (3,-1,0,1,-3,1).
%F A111666 a(0)=2, a(1)=3, a(2)=4, a(3)=5, a(4)=10, a(5)=27, a(n)=3*a(n-1)-a(n-2)+ a(n-4)- 3*a(n-5)+a(n-6). - _Harvey P. Dale_, Jan 24 2015
%t A111666 CoefficientList[Series[(-2+3x+3x^2+4x^3+3x^4-5x^5)/((x-1)(x+1)(1+x^2)(x^2-3x+1)),{x,0,30}],x] (* or *) LinearRecurrence[{3,-1,0,1,-3,1},{2,3,4,5,10,27},30] (* _Harvey P. Dale_, Jan 24 2015 *)
%Y A111666 Cf. A111664, A111665.
%K A111666 easy,nonn
%O A111666 0,1
%A A111666 _Creighton Dement_, Aug 14 2005