|
|
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
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
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
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|