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A202899
Number of n X n 0..1 arrays with every one equal to some NW, E or S neighbor
1
1, 4, 93, 4892, 993219, 734614472, 1886797510045, 17033909411139408, 542749490151188580211, 60923405609360786994296736, 24085181085169715304119038695165, 33541744941809772452897486155328823104
OFFSET
1,2
COMMENTS
Diagonal of A202906
LINKS
EXAMPLE
Some solutions for n=4
..1..1..0..0....0..0..1..1....1..1..1..1....1..1..1..0....0..0..0..0
..0..1..1..0....0..1..1..1....1..0..1..1....0..0..1..1....1..1..1..0
..0..0..1..1....1..1..0..1....1..1..0..0....1..1..1..1....1..1..1..0
..0..0..0..0....0..1..0..0....0..1..0..0....0..1..1..0....0..0..1..0
CROSSREFS
Sequence in context: A050878 A173362 A353089 * A030246 A116160 A321221
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 25 2011
STATUS
approved