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

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

Offset

0,2

Comments

Hankel transform of A131521.

Links

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

Formula

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

Mathematica

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

Prog

(Magma) [10^n*9^(n^2): n in [0..10]]; // Vincenzo Librandi, May 31 2011
(PARI) a(n)=10^n*9^(n^2) \\ Charles R Greathouse IV, Oct 09 2016

Crossrefs

Cf. A011557, A060761, A131521.

Sequence in context: A052277 A172671 A066784 * A135428 A028672 A172650

Adjacent sequences: A135318 A135319 A135320 * A135322 A135323 A135324

Keyword

nonn,easy

Author

Philippe Deléham, Dec 06 2007

Status

approved