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

1, 90, 656100, 387420489000, 18530201888518410000, 71789798769185258877024900000, 22528399544939174411840147874772641000000

Offset: 0

Author

Philippe Deléham, Dec 06 2007

Keywords

• nonn
• easy

Comments

Hankel transform of A131521.

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..30

Crossrefs

Cf. A011557, A060761, A131521.

Programs

Magma

[10^n*9^(n^2): n in [0..10]]; // Vincenzo Librandi, May 31 2011

Mathematica

Table[10^n * 9^(n^2), {n,0,10}] (* G. C. Greubel, Oct 09 2016 *)

PARI

a(n)=10^n*9^(n^2) \\ Charles R Greathouse IV, Oct 09 2016

Formula

a(n) = 10^n * 9^(n^2) = A011557(n) * A060761(n).