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A135292 a(n) = 5^n * 4^(n^2). 2
1, 20, 6400, 32768000, 2684354560000, 3518437208883200000, 73786976294838206464000000, 24758800785707605497982484480000000, 132922799578491587290380706028034457600000000 (list; graph; refs; listen; history; text; internal format)
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 A223051 A222744

Adjacent sequences:  A135289 A135290 A135291 * A135293 A135294 A135295

KEYWORD

nonn,easy

AUTHOR

Philippe Deléham, Dec 04 2007

STATUS

approved

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Last modified May 17 22:15 EDT 2021. Contains 343992 sequences. (Running on oeis4.)