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 A086829 Number of n X n matrices on n^2 distinct symbols modulo rotations and reflections. 2
 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 August 12 06:37 EDT 2024. Contains 375085 sequences. (Running on oeis4.)