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A223015
Number of 4Xn 0..1 arrays with no more than floor(4Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..1 order
1
8, 34, 169, 840, 4685, 27159, 162547, 990115, 6118763, 38172647, 239969655, 1517064784, 9633861872, 61400164050, 392501061255, 2515493966790, 16156763152645, 103972548325169, 670214851495833, 4326757779281260
OFFSET
1,1
COMMENTS
Row 4 of A223012
LINKS
EXAMPLE
Some solutions for n=3
..0..0..0....0..0..0....0..0..0....0..0..1....0..0..0....0..0..0....0..0..0
..0..0..0....1..0..1....0..0..1....0..0..0....0..0..0....1..0..1....0..0..1
..1..0..0....0..0..0....1..0..1....0..0..0....0..0..0....1..0..0....0..0..0
..1..0..0....0..0..0....1..1..1....0..0..1....1..0..0....0..0..0....1..1..1
CROSSREFS
Sequence in context: A227330 A252934 A229398 * A222796 A203445 A318244
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 11 2013
STATUS
approved