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A208395 Number of 4Xn 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors 1
14, 1094, 79092, 5800644, 424785708, 31112194860, 2278687944204, 166893600277548, 12223468411103052, 895260103173464940, 65569822288888377996, 4802404999579303113900, 351733358040572021645772 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A208392

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 61*a(n-1) +868*a(n-2) +2200*a(n-3) -7744*a(n-4) -17728*a(n-5) +40704*a(n-6) -13824*a(n-7) for n>9

EXAMPLE

Some solutions for n=4

..0..1..0..2....0..1..2..1....0..0..1..2....0..0..0..0....0..1..2..1

..1..1..1..2....2..2..1..2....2..1..0..0....1..1..0..2....2..2..0..0

..1..2..2..1....0..2..2..2....1..1..1..0....2..0..1..0....0..2..2..0

..1..1..0..1....0..0..2..1....2..1..2..2....1..2..0..2....0..1..0..1

CROSSREFS

Sequence in context: A160011 A104226 A282272 * A132504 A178989 A232373

Adjacent sequences:  A208392 A208393 A208394 * A208396 A208397 A208398

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 25 2012

STATUS

approved

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Last modified July 4 23:17 EDT 2022. Contains 355086 sequences. (Running on oeis4.)