A135292 a(n) = 5^n * 4^(n^2).

1, 20, 6400, 32768000, 2684354560000, 3518437208883200000, 73786976294838206464000000, 24758800785707605497982484480000000, 132922799578491587290380706028034457600000000

Offset

0,2

Comments

Hankel transform of A130976 .

Links

G. C. Greubel, Table of n, a(n) for n = 0..40

Formula

a(n)=5^n*4^(n^2)=A000351(n)*A060757(n).

Mathematica

Table[5^n*4^(n^2), {n, 0, 10}] (* G. C. Greubel, Oct 09 2016 *)

Prog

(PARI) a(n)=5^n*4^(n^2) \\ Charles R Greathouse IV, Oct 09 2016

Crossrefs

Sequence in context: A088852 A123379 A175015 * A222721 A396491 A223051

Adjacent sequences: A135289 A135290 A135291 * A135293 A135294 A135295

Keyword

nonn,easy

Author

Philippe Deléham, Dec 04 2007

Status

approved