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 A208857 Number of n X n 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or left-upward diagonal neighbors 0
 1, 11, 5796, 44452082, 4071491223248, 4445765748006060562, 57867813487534623493632032, 8978812485595759770697498996138448 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A208864 LINKS EXAMPLE Some solutions for n=4 ..0..1..0..0....0..0..1..0....0..0..0..1....0..0..0..1....0..1..1..2 ..2..2..1..2....2..1..2..2....1..1..1..2....0..1..1..0....0..1..0..0 ..1..1..3..2....1..3..0..0....2..2..2..0....0..1..2..3....0..1..3..1 ..0..3..0..0....1..3..2..2....0..3..0..1....3..0..3..1....1..2..2..0 CROSSREFS Sequence in context: A216790 A068730 A257124 * A214162 A167068 A273942 Adjacent sequences:  A208854 A208855 A208856 * A208858 A208859 A208860 KEYWORD nonn AUTHOR R. H. Hardin Mar 02 2012 STATUS approved

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Last modified January 28 21:04 EST 2022. Contains 350664 sequences. (Running on oeis4.)