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A135321 a(n) = 10^n * 9^(n^2). 2

%I

%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

%K nonn,easy

%O 0,2

%A _Philippe Deléham_, Dec 06 2007

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Last modified April 21 06:42 EDT 2019. Contains 322310 sequences. (Running on oeis4.)