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A085534 a(n) = (2n)^(2n). 6
1, 4, 256, 46656, 16777216, 10000000000, 8916100448256, 11112006825558016, 18446744073709551616, 39346408075296537575424, 104857600000000000000000000, 341427877364219557396646723584, 1333735776850284124449081472843776, 6156119580207157310796674288400203776 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

All terms are both perfect squares and numbers of the form n^n. - William Boyles, Jul 31 2015

Intersection of A000290 and A000312. - Michel Marcus, Aug 04 2015

Intersection of A005843 and A000312. - Robert Israel, Aug 04 2015

The number of sequences of length 2n using 2n symbols. - Washington Bomfim, Jan 14 2020

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..100

FORMULA

a(n) = A000312(2*n). - Michel Marcus, Jul 31 2015

a(n) = A062971(n)^2. - Michel Marcus, Aug 04 2015

a(n) = [x^(2*n)] 1/(1 - 2*n*x). - Ilya Gutkovskiy, Oct 10 2017

MATHEMATICA

{1}~Join~Table[(2 n)^(2 n), {n, 1, 4!}] (* Michael De Vlieger, Aug 04 2015 *)

CROSSREFS

Cf. A000312.

Column k=0 of A246070.

Sequence in context: A266890 A013734 A209588 * A071617 A223755 A223844

Adjacent sequences:  A085531 A085532 A085533 * A085535 A085536 A085537

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jul 05 2003

STATUS

approved

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Last modified November 29 13:17 EST 2021. Contains 349416 sequences. (Running on oeis4.)