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
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
KEYWORD
nonn,easy
AUTHOR
Eric W. Weisstein, Aug 08 2003
EXTENSIONS
More terms from Sam Alexander, Feb 27 2004
STATUS
approved