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 A183793 1/4 the number of (n+1)X(n+1) 0..3 arrays with no 2X2 subblock having sum 6 0
 53, 31541, 209636605, 15624102535570, 13038188765075658693, 121880956287359200992546463 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A183802 LINKS EXAMPLE Some solutions for 3X3 ..2..2..0....1..0..3....1..2..0....0..0..2....2..1..3....0..1..0....2..3..3 ..2..1..1....2..2..3....0..1..1....3..2..1....3..3..1....1..0..1....3..3..2 ..3..3..3....3..0..2....1..3..0....3..2..3....3..1..3....0..1..2....2..3..1 CROSSREFS Sequence in context: A093253 A234603 A169595 * A145332 A087530 A125037 Adjacent sequences:  A183790 A183791 A183792 * A183794 A183795 A183796 KEYWORD nonn AUTHOR R. H. Hardin Jan 07 2011 STATUS approved

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