login
A209586
Number of n X n 0..1 arrays with every element equal to a diagonal or antidiagonal reflection
2
2, 16, 192, 9216, 663552, 191102976, 82556485632, 142657607172096, 369768517790072832, 3833759992447475122176, 59622635402543133100081152, 3709004903121403223889848303616, 346094665520064377627609524907016192
OFFSET
1,1
COMMENTS
Column 1 of A209593
LINKS
FORMULA
a(n) = 2 ^ (2*n-(n modulo 2)) * 6 ^ ((n*n-2*n+(n modulo 2))/4)
EXAMPLE
Some solutions for n=3
..0..1..0....1..0..0....1..0..0....1..1..1....0..0..1....0..0..0....1..1..1
..1..1..0....0..0..0....0..0..0....0..1..1....1..0..0....1..1..0....0..1..1
..0..0..1....1..0..0....0..0..1....1..0..1....0..1..0....0..1..0....1..0..0
CROSSREFS
Sequence in context: A292347 A051711 A274448 * A334237 A356585 A012683
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 10 2012
STATUS
approved