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 A095681 #16 May 08 2023 07:36:45 %S A095681 1,3,8,19,42,89,183,368,728,1422,2750,5276,10057,19069,35998,67707, %T A095681 126954,237423,443029,825116,1534224,2848736,5283100,9787452,18115705, %U A095681 33504067,61921452,114373263,211145050,389618073,718660963,1325126972,2442633472,4501351758 %N A095681 Expansion of 1/((1-x)(1-x-x^2)(1-x-x^2-x^3)). %H A095681 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (3,-1,-2,-1,1,1). %F A095681 G.f.: 1/((1-x)*(1-x-x^2)*(1-x-x^2-x^3)). %F A095681 a(n) = 3*a(n-1) - a(n-2) - 2*a(n-3) - a(n-4) + a(n-5) + a(n-6). - _Wesley Ivan Hurt_, May 08 2023 %Y A095681 Cf. A000071, A138155. %K A095681 nonn,easy %O A095681 0,2 %A A095681 _Jon Perry_, Jul 04 2004 %E A095681 Corrected by _T. D. Noe_, Oct 25 2006