A237333 Number of (n+1)X(1+1) 0..3 arrays with the maximum minus the minimum of every 2X2 subblock equal

256, 1980, 15082, 120808, 972356, 7935194, 65088736, 536949612, 4446049514, 36942292664, 307835761076, 2571906893178, 21538160121328, 180756078794140, 1519926867217162, 12803364991634568, 108025697029512484

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