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 A209889 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having two distinct values, and new values 0..2 introduced in row major order 0
 7, 280, 32800, 11857440, 13410113952, 48053885453696, 549425473875967488, 20157265447359860793760, 2382356941753966065667915808, 909958586859400389363702903272960 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A209897 LINKS EXAMPLE Some solutions for n=4 ..0..0..1..1..1....0..0..1..1..1....0..0..0..1..1....0..1..0..2..1 ..1..0..1..2..2....2..0..0..0..0....2..0..1..0..1....0..1..0..2..1 ..0..1..1..2..1....2..0..1..1..1....2..0..1..0..0....0..0..0..2..2 ..1..0..1..2..1....2..0..0..0..1....2..0..1..0..1....0..1..0..2..0 ..1..1..1..1..1....2..2..0..1..0....2..0..0..0..1....0..1..0..2..0 CROSSREFS Sequence in context: A065581 A062646 A009503 * A176072 A096548 A160072 Adjacent sequences:  A209886 A209887 A209888 * A209890 A209891 A209892 KEYWORD nonn AUTHOR R. H. Hardin Mar 14 2012 STATUS approved

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Last modified February 18 21:20 EST 2020. Contains 332028 sequences. (Running on oeis4.)