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A085535 a(n) = (2n)^(2n-1). 3
2, 64, 7776, 2097152, 1000000000, 743008370688, 793714773254144, 1152921504606846976, 2185911559738696531968, 5242880000000000000000000, 15519448971100888972574851072, 55572324035428505185378394701824, 236773830007967588876795164938469376 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(0) is 0^(-1) = 1/0, which is undefined.

LINKS

Table of n, a(n) for n=1..13.

FORMULA

a(n) = A005843(n)^A005408(n-1). - Michel Marcus, Apr 14 2018

Sum_{n>=1} 1/a(n) = A338167. - Amiram Eldar, Nov 29 2020

MATHEMATICA

Table[(2*n)^(2*n - 1), {n, 20}] (* T. D. Noe, Feb 26 2013 *)

CROSSREFS

Cf. A005408, A005843, A222621, A338167.

Sequence in context: A210930 A263185 A155957 * A060613 A139772 A348214

Adjacent sequences:  A085532 A085533 A085534 * A085536 A085537 A085538

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jul 05 2003

STATUS

approved

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Last modified December 9 08:41 EST 2021. Contains 349627 sequences. (Running on oeis4.)