A186787 Half the number of (n+2)X(n+2) binary arrays with each 3X3 subblock having a sum in 2..7

246, 29020, 13066921, 22495797451, 147985903265501, 3720538199779806652, 357466055151669297136736, 131253399322834546449506492207

Offset

1,1

Comments

Diagonal of A186796

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A251517 A293369 A212475 * A229478 A289334 A251516

Adjacent sequences: A186784 A186785 A186786 * A186788 A186789 A186790

Keyword

nonn

Author

R. H. Hardin Feb 26 2011

Status

approved