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 A341597 #9 Feb 15 2021 22:36:40 %S A341597 1,60,490,2220,7315,19656,45780,95880,184965,334180,572286,937300, %T A341597 1478295,2257360,3351720,4856016,6884745,9574860,13088530,17616060, %U A341597 23378971,30633240,39672700,50832600,64493325,81084276,101087910 %N A341597 a(n) = A144066(n+3,3). %H A341597 <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (7,-21,35,-35,21,-7,1). %F A341597 O.g.f.: (15*x^3 + 91*x^2 + 53*x + 1)/(1 - x)^7. %Y A341597 Cf. A144066. %K A341597 nonn,easy %O A341597 0,2 %A A341597 _Petros Hadjicostas_, Feb 15 2021