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%I #12 Sep 08 2022 08:45:32
%S 1,90,656100,387420489000,18530201888518410000,
%T 71789798769185258877024900000,
%U 22528399544939174411840147874772641000000
%N a(n) = 10^n * 9^(n^2).
%C Hankel transform of A131521.
%H Vincenzo Librandi, <a href="/A135321/b135321.txt">Table of n, a(n) for n = 0..30</a>
%F a(n) = 10^n * 9^(n^2) = A011557(n) * A060761(n).
%t Table[10^n * 9^(n^2), {n,0,10}] (* _G. C. Greubel_, Oct 09 2016 *)
%o (Magma) [10^n*9^(n^2): n in [0..10]]; // _Vincenzo Librandi_, May 31 2011
%o (PARI) a(n)=10^n*9^(n^2) \\ _Charles R Greathouse IV_, Oct 09 2016
%Y Cf. A011557, A060761, A131521.
%K nonn,easy
%O 0,2
%A _Philippe Deléham_, Dec 06 2007
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