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 A225490 #10 Oct 06 2023 11:35:29
%S A225490 1,1,2,3,5,7,10,15,21,30,42,60,84,118,166,233,327,458,643,901,1263,
%T A225490 1770,2481,3477,4872,6828,9568,13408,18788,26328,36893,51697,72442,
%U A225490 101511,142245,199323,279306,391383,548433
%N A225490 Expansion of 1/(1 - x - x^2 + x^5 + x^6 - x^7).
%C A225490 Limiting ratio is 1.401268367939855..., the largest real root of -1 + x + x^2 - x^5 - x^6 + x^7.
%H A225490 Vincenzo Librandi, <a href="/A225490/b225490.txt">Table of n, a(n) for n = 0..1000</a>
%H A225490 <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (1, 1, 0, 0, -1, -1, 1).
%t A225490 CoefficientList[Series[1/(1 - x - x^2 + x^5 + x^6 - x^7), {x, 0, 50}], x]
%Y A225490 Cf. A117791, A107293, A204631, A225391, A225482, A225484.
%K A225490 nonn,easy
%O A225490 0,3
%A A225490 _Roger L. Bagula_, May 08 2013