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 A203453 Number of n X n 0..2 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors 0
 1, 3, 84, 8837, 5660631, 22078482448, 449985495293440, 48224646798077538850 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A203460 LINKS EXAMPLE Some solutions for n=5 ..2..2..2..0..0....2..2..1..1..0....0..2..2..2..2....1..1..0..0..0 ..2..0..2..1..0....2..2..1..1..1....0..2..2..2..2....1..2..2..1..0 ..2..1..2..1..0....0..1..2..2..1....0..1..0..0..0....2..2..2..1..0 ..2..1..2..2..0....2..2..2..2..1....1..1..2..2..0....2..0..0..2..2 ..2..2..2..2..0....2..2..0..0..0....1..1..2..2..0....2..2..2..2..2 CROSSREFS Sequence in context: A160880 A261008 A217524 * A086264 A160878 A152791 Adjacent sequences:  A203450 A203451 A203452 * A203454 A203455 A203456 KEYWORD nonn AUTHOR R. H. Hardin Jan 02 2012 STATUS approved

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Last modified July 29 12:47 EDT 2021. Contains 346346 sequences. (Running on oeis4.)