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A086829 Number of n X n matrices on n^2 distinct symbols modulo rotations and reflections. 1
1, 3, 45360, 2615348736000, 1938901255416373248000000, 46499165848737652183499931018854400000000, 76035233004283445109031520415161922110944103922401280000000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Also the number of distinct adjacency matrices on the n X n grid graph P_n x P_n. - Eric W. Weisstein, May 01 2017

LINKS

Table of n, a(n) for n=1..7.

Eric Weisstein's World of Mathematics, Adjacency Matrix

Eric Weisstein's World of Mathematics, Grid Graph

Eric Weisstein's World of Mathematics, Square Matrix

FORMULA

a(n) = (n^2)!/8, n>1. - Vladeta Jovovic, Aug 10 2003

MATHEMATICA

Table[Piecewise[{{1, n == 1}}, (n^2)!/8], {n, 7}]

CROSSREFS

Cf. A087074.

Sequence in context: A140656 A135760 A003541 * A190722 A171365 A115976

Adjacent sequences:  A086826 A086827 A086828 * A086830 A086831 A086832

KEYWORD

nonn,easy

AUTHOR

Eric W. Weisstein, Aug 08 2003

EXTENSIONS

More terms from Sam Alexander, Feb 27 2004

STATUS

approved

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Last modified November 27 20:49 EST 2021. Contains 349395 sequences. (Running on oeis4.)