login
A204390
Number of (n+2)X(n+2) 0..1 arrays with no 3X3 subblock having three equal diagonal elements or three equal antidiagonal elements, and new values 0..1 introduced in row major order
1
144, 4050, 259808, 25233408, 5406738528, 2134049909922, 1597165262402016, 2318118449955569282, 6416215460503014746112, 33850489754410068455670578, 342799382812784238626135423232, 6643766502379498331477812982056992
OFFSET
1,1
COMMENTS
Diagonal of A204398
LINKS
EXAMPLE
Some solutions for n=3
..0..1..1..0..1....0..0..0..1..1....0..1..0..1..1....0..1..1..1..0
..0..1..0..1..1....0..1..1..0..0....1..1..0..1..1....1..1..1..1..0
..0..1..0..0..0....1..0..0..1..1....1..0..0..0..0....0..0..1..0..0
..1..0..1..0..1....0..1..1..1..0....1..0..1..0..1....0..0..1..0..0
..1..0..1..0..1....1..0..0..0..1....1..1..1..0..1....1..1..1..1..0
CROSSREFS
Sequence in context: A128989 A257298 A271672 * A343295 A008376 A221127
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 15 2012
STATUS
approved