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 A135421 #13 Sep 08 2022 08:45:32
%S A135421 1,30,32400,1259712000,1763193692160000,88844650093530316800000,
%T A135421 161162887476414617908936704000000,
%U A135421 10524495800322448706290880214277816320000000,24742299477723936603969643338598393206990805401600000000
%N A135421 a(n) = 5^n*6^(n^2).
%C A135421 Hankel transform of A132865.
%H A135421 Vincenzo Librandi, <a href="/A135421/b135421.txt">Table of n, a(n) for n = 0..25</a>
%F A135421 a(n) = 5^n*6^(n^2) = A000351(n)*A076781(n).
%t A135421 Table[5^n 6^(n^2),{n,0,10}] (* _Harvey P. Dale_, Sep 09 2012 *)
%o A135421 (Magma) [5^n*6^(n^2): n in [0..10]]; // _Vincenzo Librandi_, May 30 2011
%K A135421 nonn
%O A135421 0,2
%A A135421 _Philippe Deléham_, Dec 11 2007