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 A187931 Number of (n+2)X(n+2) binary arrays with every 2X2 subblock sum equal to some diagonal or antidiagonal neighbor 2X2 subblock sum 0
 48, 104, 7616, 544222, 167909728 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A187940 LINKS EXAMPLE Some solutions for 4X4 ..0..1..0..0....1..1..0..1....0..1..0..0....1..1..1..1....1..0..1..1 ..1..0..1..1....0..0..0..1....1..0..1..1....0..1..0..1....0..1..0..0 ..0..1..0..0....0..1..1..1....0..1..0..1....1..1..1..1....1..0..1..1 ..1..0..1..1....0..1..0..0....0..1..1..0....1..0..1..0....0..1..0..0 CROSSREFS Sequence in context: A113797 A260294 A260287 * A191837 A044235 A044616 Adjacent sequences:  A187928 A187929 A187930 * A187932 A187933 A187934 KEYWORD nonn AUTHOR R. H. Hardin Mar 16 2011 STATUS approved

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Last modified October 14 09:25 EDT 2019. Contains 327995 sequences. (Running on oeis4.)