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 A017227 #17 Sep 08 2022 08:44:42
%S A017227 78125,105413504,3404825447,34359738368,194754273881,781250000000,
%T A017227 2488651484819,6722988818432,16048523266853,34792782221696,
%U A017227 69833729609375,131593177923584,235260548044817,402271083010688
%N A017227 a(n) = (9*n + 5)^7.
%H A017227 Vincenzo Librandi, <a href="/A017227/b017227.txt">Table of n, a(n) for n = 0..10000</a>
%H A017227 <a href="/index/Rec#order_08">Index entries for linear recurrences with constant coefficients</a>, signature (8, -28, 56, -70, 56, -28, 8, -1).
%F A017227 a(n) = 8*a(n-1) - 28*a(n-2) + 56*a(n-3) - 70*a(n-4) + 56*a(n-5) - 28*a(n-6) + 8*a(n-7) - a(n-8); a(0)=78125, a(1)=105413504, a(2)=3404825447, a(3)=34359738368, a(4)=194754273881, a(5)=781250000000, a(6)=2488651484819, a(7)=6722988818432. - _Harvey P. Dale_, Apr 13 2014
%t A017227 (9*Range[0,20]+5)^7 (* or *) LinearRecurrence[{8,-28,56,-70,56,-28,8,-1},{78125,105413504,3404825447,34359738368,194754273881,781250000000,2488651484819,6722988818432},20] (* _Harvey P. Dale_, Apr 13 2014 *)
%o A017227 (Magma) [(9*n+5)^7: n in [0..20]]; // _Vincenzo Librandi_, Jul 24 2011
%K A017227 nonn,easy
%O A017227 0,1
%A A017227 _N. J. A. Sloane_