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 A017169 #17 Sep 08 2022 08:44:41
%S A017169 0,387420489,198359290368,7625597484987,101559956668416,
%T A017169 756680642578125,3904305912313344,15633814156853823,51998697814228992,
%U A017169 150094635296999121,387420489000000000,913517247483640899
%N A017169 a(n) = (9*n)^9.
%C A017169 a(n) = A155955(n,9) for n > 8. - _Reinhard Zumkeller_, Jan 31 2009
%H A017169 Vincenzo Librandi, <a href="/A017169/b017169.txt">Table of n, a(n) for n = 0..10000</a>
%H A017169 <a href="/index/Rec#order_10">Index entries for linear recurrences with constant coefficients</a>, signature (10, -45, 120, -210, 252, -210, 120, -45, 10, -1).
%F A017169 a(n) = 387420489*A001017(n). - _R. J. Mathar_, Jul 07 2017
%t A017169 (9*Range[0,20])^9 (* or *) LinearRecurrence[{10,-45,120,-210,252,-210,120,-45,10,-1},{0,387420489,198359290368,7625597484987,101559956668416,756680642578125,3904305912313344,15633814156853823,51998697814228992,150094635296999121},20] (* _Harvey P. Dale_, Dec 11 2017 *)
%o A017169 (Magma) [(9*n)^9: n in [0..20]]; // _Vincenzo Librandi_, Jul 22 2011
%K A017169 nonn,easy
%O A017169 0,2
%A A017169 _N. J. A. Sloane_