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A235426 Number of (n+1)X(1+1) 0..3 arrays with the difference between each 2X2 subblock maximum and minimum lexicographically nondecreasing rowwise and columnwise 2
256, 3038, 33610, 344668, 3402366, 32542312, 304784986, 2807381170, 25538118636, 230002990420, 2055091563588, 18243652764916, 161094988392244, 1416214588819266, 12404115758918922, 108303485972137448 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A235430

LINKS

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

FORMULA

Empirical: a(n) = 15*a(n-1) -17*a(n-2) -518*a(n-3) +1159*a(n-4) +5713*a(n-5) -11569*a(n-6) -22194*a(n-7) +35356*a(n-8) +29720*a(n-9) -34208*a(n-10) -11136*a(n-11) +7680*a(n-12)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A205928 A235665 A235430 * A236299 A236296 A138333

Adjacent sequences:  A235423 A235424 A235425 * A235427 A235428 A235429

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 10 2014

STATUS

approved

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Last modified September 23 04:54 EDT 2020. Contains 337295 sequences. (Running on oeis4.)