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 A198478 #16 Sep 08 2022 08:45:59
%S A198478 0,9,41472,14348907,1719926784,115330078125,5355700839936,
%T A198478 193010051319183,5777633090469888,150094635296999121,
%U A198478 3486784401000000000,73994897046174912819,1457274373159131021312,26955214582765006137717
%N A198478 a(n) = 9^n * n^9.
%H A198478 Vincenzo Librandi, <a href="/A198478/b198478.txt">Table of n, a(n) for n = 0..1000</a>
%F A198478 G.f.: 9*x*(1 + 4518*x + 1183248*x^2 + 64322586*x^3 + 1024762590*x^4 + 5210129466*x^5 + 7763290128*x^6 + 2401050438*x^7 + 43046721*x^8)/(1 - 9*x)^10. - _Colin Barker_, Apr 30 2013
%F A198478 a(n) = A001019(n)*A001017(n). - _Michel Marcus_, May 18 2022
%t A198478 Table[9^n*n^9, {n, 0, 20}] (* _G. C. Greubel_, May 17 2022 *)
%o A198478 (Magma) [9^n*n^9: n in [0..20]]
%o A198478 (SageMath) [9^n*n^9 for n in (0..20)] # _G. C. Greubel_, May 17 2022
%Y A198478 Cf. A001017, A001019.
%Y A198478 Cf. A007758, A062074, A062075, A097206, A098803, A098880.
%K A198478 nonn,easy
%O A198478 0,2
%A A198478 _Vincenzo Librandi_, Oct 27 2011