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A238306 Number of (n+1) X (1+1) 0..3 arrays with the maximum minus the lower median of every 2 X 2 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
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
Cf. A238311.
Sequence in context: A237899 A238311 A205944 * A205937 A237911 A237905
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 24 2014
STATUS
approved

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Last modified June 13 10:09 EDT 2024. Contains 373383 sequences. (Running on oeis4.)