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A222772
Number of 4Xn 0..1 arrays with exactly floor(4Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..1 order
1
0, 20, 96, 465, 2608, 15077, 89811, 544302, 3349328, 20823047, 130535918, 823585242, 5221057054, 33231082276, 212180118775, 1358528423728, 8718262087314, 56062919553225, 361148981248207, 2330144611056838
OFFSET
1,2
COMMENTS
Row 4 of A222769
LINKS
EXAMPLE
Some solutions for n=3
..0..0..0....0..0..0....0..0..0....0..0..0....0..0..1....0..0..1....0..0..0
..0..1..0....1..1..1....0..0..1....0..0..0....0..1..0....0..0..0....0..0..1
..1..0..0....0..1..1....0..0..0....0..1..0....0..0..0....0..1..1....0..0..1
..0..0..0....1..1..1....0..1..1....0..1..1....0..0..0....1..1..1....0..1..1
CROSSREFS
Sequence in context: A126407 A158446 A221704 * A267646 A264424 A039610
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 05 2013
STATUS
approved