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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A183782

LINKS

Table of n, a(n) for n=1..13.

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

Adjacent sequences:  A183770 A183771 A183772 * A183774 A183775 A183776

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 07 2011

STATUS

approved

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Last modified May 10 14:32 EDT 2021. Contains 343771 sequences. (Running on oeis4.)