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 A047670 #15 Mar 07 2020 01:49:43
%S A047670 6,37,158,529,1486,3653,8086,16449,31222,55941,95470,156305,246910,
%T A047670 378085,563366,819457,1166694,1629541,2237118,3023761,4029614,5301253,
%U A047670 6892342,8864321,11287126,14239941,17811982,22103313,27225694,33303461,40474438,48890881
%N A047670 Row 6 of array in A047666.
%H A047670 Colin Barker, <a href="/A047670/b047670.txt">Table of n, a(n) for n = 1..1000</a>
%H A047670 <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (7,-21,35,-35,21,-7,1).
%F A047670 a(n) = (1/45) * (2n^6 + 50n^4 + 173 + 45).
%F A047670 G.f.: -x*(x^6 - x^5 + 16*x^4 - 10*x^3 + 25*x^2 - 5*x + 6) / (x-1)^7. - _Colin Barker_, Nov 24 2014
%t A047670 LinearRecurrence[{7,-21,35,-35,21,-7,1},{6,37,158,529,1486,3653,8086},40] (* _Harvey P. Dale_, Jun 15 2018 *)
%o A047670 (PARI) Vec(-x*(x^6-x^5+16*x^4-10*x^3+25*x^2-5*x+6)/(x-1)^7 + O(x^100)) \\ _Colin Barker_, Nov 24 2014
%K A047670 nonn,easy
%O A047670 1,1
%A A047670 _N. J. A. Sloane_
%E A047670 More terms from _Colin Barker_, Nov 24 2014