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 A208252 Number of n X n 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than one of its immediate leftward or upward neighbors 1
 1, 12, 2040, 2445264, 20662697664, 1230875651548608, 516901401841519506624, 1530268623239822606574667872, 31936997040921403605588139690977984, 4698799611233642481043318409392291549604736 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A208258 LINKS R. H. Hardin, Table of n, a(n) for n = 1..13 EXAMPLE Some solutions for n=4 ..0..0..0..1....0..0..0..0....0..0..1..2....0..0..0..0....0..0..0..1 ..1..1..0..1....1..0..1..0....0..2..2..0....0..1..0..2....2..1..0..2 ..2..2..1..0....2..2..1..2....2..0..0..1....2..0..1..2....2..0..1..2 ..1..1..0..1....0..0..2..0....2..1..2..1....0..2..1..0....1..0..1..2 CROSSREFS Sequence in context: A323817 A263584 A323816 * A204622 A004823 A342964 Adjacent sequences:  A208249 A208250 A208251 * A208253 A208254 A208255 KEYWORD nonn AUTHOR R. H. Hardin Feb 24 2012 STATUS approved

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Last modified August 19 05:06 EDT 2022. Contains 356216 sequences. (Running on oeis4.)