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A237333 Number of (n+1)X(1+1) 0..3 arrays with the maximum minus the minimum of every 2X2 subblock equal 1
256, 1980, 15082, 120808, 972356, 7935194, 65088736, 536949612, 4446049514, 36942292664, 307835761076, 2571906893178, 21538160121328, 180756078794140, 1519926867217162, 12803364991634568, 108025697029512484 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237340

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=4

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

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

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

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

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

CROSSREFS

Sequence in context: A205659 A205363 A237340 * A221487 A014711 A236451

Adjacent sequences:  A237330 A237331 A237332 * A237334 A237335 A237336

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 06 2014

STATUS

approved

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Last modified September 25 15:27 EDT 2021. Contains 347658 sequences. (Running on oeis4.)