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A060722 a(n) = 3^(n^2). 8
1, 3, 81, 19683, 43046721, 847288609443, 150094635296999121, 239299329230617529590083, 3433683820292512484657849089281, 443426488243037769948249630619149892803 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

The number of n X n {-1,0,1}-matrices (the same as the number of n X n matrices over GF(3) ).

LINKS

Harry J. Smith, Table of n, a(n) for n=0,...,45

FORMULA

a(n) = [x^n] 1/(1 - 3^n*x). - Ilya Gutkovskiy, Oct 10 2017

MAPLE

for n from 1 to 15 do printf(`%d, `, 3^(n^2)) od:

PROG

(PARI) { for (n=0, 45, write("b060722.txt", n, " ", 3^(n^2)); ) } \\ Harry J. Smith, Jul 10 2009

(PARI) a(n) = 3^(n^2); \\ Joerg Arndt, Feb 23 2014

CROSSREFS

Sequence in context: A206693 A223570 A228971 * A183502 A134799 A055590

Adjacent sequences:  A060719 A060720 A060721 * A060723 A060724 A060725

KEYWORD

nonn,easy,changed

AUTHOR

Avi Peretz (njk(AT)netvision.net.il), Apr 21 2001

EXTENSIONS

More terms from James A. Sellers, Apr 24 2001

a(0) = 1 added by N. J. A. Sloane, Nov 23 2007

STATUS

approved

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Last modified October 21 00:56 EDT 2017. Contains 293679 sequences.