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A237905 Number of (n+1)X(1+1) 0..3 arrays with the maximum minus the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
256, 1780, 12552, 88544, 635200, 4438816, 31507328, 221652256, 1584432064, 11094868672, 78930109696, 554462140416, 3957466858304, 27739531863040, 197546198927360, 1386754238612992, 9890947053918976, 69362350056729600 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237911

LINKS

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

FORMULA

Empirical: a(n) = 1884*a(n-4) +28048*a(n-6) +134800*a(n-8) +241600*a(n-10) +86848*a(n-12) -80384*a(n-14) +25600*a(n-16) for n>17

EXAMPLE

Some solutions for n=4

..2..0....1..0....2..2....2..1....3..0....3..3....1..1....2..0....3..3....1..0

..2..3....2..3....1..2....3..0....2..2....1..3....2..0....0..0....0..1....3..2

..1..3....2..3....3..2....3..1....0..0....2..2....0..2....0..3....2..1....3..2

..2..0....1..2....2..3....1..2....0..1....0..0....0..1....0..1....2..0....1..2

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

CROSSREFS

Sequence in context: A238306 A205937 A237911 * A238145 A238140 A238298

Adjacent sequences:  A237902 A237903 A237904 * A237906 A237907 A237908

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 15 2014

STATUS

approved

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Last modified September 27 15:39 EDT 2022. Contains 357062 sequences. (Running on oeis4.)