A187955 Half the number of (n+2)X(n+2) binary arrays with no 3X3 subblock having a sum equal to any horizontal or vertical neighbor 3X3 subblock sum

256, 8768, 359488, 15189800, 1218772461

Offset

1,1

Comments

Diagonal of A187964

Links

Table of n, a(n) for n=1..5.

Example

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

Crossrefs

Sequence in context: A206129 A236214 A232959 * A253135 A128991 A230973

Adjacent sequences: A187952 A187953 A187954 * A187956 A187957 A187958

Keyword

nonn

Author

R. H. Hardin Mar 16 2011

Status

approved