A183783 Half the number of (n+1) X (n+1) 0..2 arrays with no 2 X 2 subblock having sum 4.

31, 3552, 2214457, 7635071835, 144396520117972, 15033760617564577257, 8603578492435516321649249, 27081302315719663051228636805358

Offset

1,1

Comments

Diagonal of A183792.

Links

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

Example

Some solutions for 3 X 3
..0..2..2....2..2..2....0..0..0....0..1..1....2..0..0....1..0..0....0..2..1
..2..2..1....2..2..2....0..0..0....0..2..1....2..2..0....2..2..0....1..2..2
..1..1..1....0..1..1....1..1..1....2..2..1....0..2..2....1..0..0....1..2..0

Crossrefs

Cf. A183792.

Sequence in context: A262926 A330398 A218661 * A072913 A001237 A289397

Adjacent sequences: A183780 A183781 A183782 * A183784 A183785 A183786

Keyword

nonn

Author

R. H. Hardin, Jan 07 2011

Status

approved