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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.)