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A238306 Number of (n+1)X(1+1) 0..3 arrays with the maximum minus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
256, 1776, 12372, 85984, 601408, 4181152, 29228452, 203246304, 1421071696, 9880770000, 69080413972, 480334502816, 3358287402480, 23350820066560, 163257404108900, 1135164126221856, 7936527281285216, 55184332702741168 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A238311

LINKS

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

FORMULA

Empirical: a(n) = 1419*a(n-4) +36268*a(n-6) +410501*a(n-8) +2593208*a(n-10) +10304257*a(n-12) +28327948*a(n-14) +55782736*a(n-16) +83338496*a(n-18) +93171712*a(n-20) +85534720*a(n-22) +49102848*a(n-24) +25690112*a(n-26)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A237899 A238311 A205944 * A205937 A237911 A237905

Adjacent sequences:  A238303 A238304 A238305 * A238307 A238308 A238309

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 24 2014

STATUS

approved

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Last modified September 22 07:34 EDT 2020. Contains 337289 sequences. (Running on oeis4.)