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A183773
Half the number of (n+1)X(n+1) binary arrays with no 2X2 subblock having exactly 2 ones
0
5, 47, 730, 21935, 1146964, 112439612, 19815396763, 6453534773135, 3829236554668274, 4179465974043040784, 8354373579461755560239, 30686484702497770109712496, 206872691877488790419478443459
OFFSET
1,1
COMMENTS
Diagonal of A183782
EXAMPLE
Some solutions with a(1,1)=0 for 3X3
..0..1..0....0..0..0....0..0..1....0..0..0....0..0..0....0..1..0....0..0..0
..0..0..0....1..0..0....0..0..0....0..0..1....0..0..0....0..0..0....0..1..0
..0..0..0....0..0..0....1..0..0....0..1..1....1..0..1....0..0..1....1..1..1
CROSSREFS
Sequence in context: A254530 A086555 A246040 * A247982 A222078 A061572
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 07 2011
STATUS
approved