A183457 Number of (n+4)X(n+4) binary arrays with every 1 having exactly three king-move neighbors equal to 1 but with no 2X2 blocks of 1s

1, 3, 32, 199, 8702, 248303, 15282749, 2019698992, 349874591303

Offset

1,2

Comments

Diagonal of A183465

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for 7X7
..0..0..0..1..0..0..0....0..0..0..1..0..0..0....0..0..0..0..1..0..0
..0..0..1..1..1..0..0....0..0..1..1..1..0..0....0..0..0..1..1..1..0
..0..1..0..0..0..1..0....0..1..0..0..0..1..0....0..0..1..0..0..0..1
..1..1..0..0..1..1..0....1..1..0..0..0..1..1....0..1..1..0..0..1..1
..1..0..0..0..1..0..0....0..1..0..0..0..1..0....0..0..1..0..0..0..1
..0..1..1..1..0..0..0....0..0..1..1..1..0..0....0..0..0..1..1..1..0
..0..0..1..0..0..0..0....0..0..0..1..0..0..0....0..0..0..0..1..0..0

Crossrefs

Sequence in context: A221464 A119940 A004256 * A322234 A264574 A002059

Adjacent sequences: A183454 A183455 A183456 * A183458 A183459 A183460

Keyword

nonn

Author

R. H. Hardin Jan 05 2011

Status

approved