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 A135428 #12 Sep 08 2022 08:45:32
%S A135428 1,90,810000,729000000000,65610000000000000000,
%T A135428 590490000000000000000000000000,
%U A135428 531441000000000000000000000000000000000000
%N A135428 a(n) = 9^n * 10^(n^2).
%C A135428 Hankel transform of A132897.
%H A135428 Vincenzo Librandi, <a href="/A135428/b135428.txt">Table of n, a(n) for n = 0..30</a>
%F A135428 a(n) = 9^n*10^(n^2) = A001019(n)*A076782(n).
%t A135428 Table[9^n * 10^(n^2), {n,0,10}] (* _G. C. Greubel_, Oct 14 2016 *)
%o A135428 (Magma) [9^n*10^(n^2): n in [0..10]]; // _Vincenzo Librandi_, May 26 2011
%Y A135428 Cf. A001019, A076782, A132897.
%K A135428 nonn
%O A135428 0,2
%A A135428 _Philippe Deléham_, Dec 12 2007