A186816 Half the number of (n+2)X(n+2) binary arrays with each 3X3 subblock having sum 4 or 5

126, 3988, 222632, 24581099, 5634207241, 2438542117645, 2065963672906699

Offset

1,1

Comments

Diagonal of A186825

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for 4X4 with a(1,1)=0
..0..1..0..1....0..1..1..0....0..0..0..0....0..1..0..1....0..0..0..0
..1..0..1..1....0..0..1..0....0..1..1..1....1..0..1..1....1..1..0..0
..1..1..0..0....1..1..0..0....0..1..1..0....1..0..0..0....0..1..1..1
..0..0..1..0....1..0..1..1....0..0..0..0....1..1..0..1....0..0..0..1

Crossrefs

Sequence in context: A285857 A036403 A286976 * A292882 A140902 A270512

Adjacent sequences: A186813 A186814 A186815 * A186817 A186818 A186819

Keyword

nonn

Author

R. H. Hardin Feb 27 2011

Status

approved