A237905 Number of (n+1)X(1+1) 0..3 arrays with the maximum minus the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one

256, 1780, 12552, 88544, 635200, 4438816, 31507328, 221652256, 1584432064, 11094868672, 78930109696, 554462140416, 3957466858304, 27739531863040, 197546198927360, 1386754238612992, 9890947053918976, 69362350056729600

Offset

1,1

Comments

Column 1 of A237911

Links

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

Formula

Empirical: a(n) = 1884*a(n-4) +28048*a(n-6) +134800*a(n-8) +241600*a(n-10) +86848*a(n-12) -80384*a(n-14) +25600*a(n-16) for n>17

Example

Some solutions for n=4
..2..0....1..0....2..2....2..1....3..0....3..3....1..1....2..0....3..3....1..0
..2..3....2..3....1..2....3..0....2..2....1..3....2..0....0..0....0..1....3..2
..1..3....2..3....3..2....3..1....0..0....2..2....0..2....0..3....2..1....3..2
..2..0....1..2....2..3....1..2....0..1....0..0....0..1....0..1....2..0....1..2
..2..1....2..1....0..2....1..2....1..0....1..2....1..1....2..0....0..1....2..1

Crossrefs

Sequence in context: A238306 A205937 A237911 * A238145 A238140 A238298

Adjacent sequences: A237902 A237903 A237904 * A237906 A237907 A237908

Keyword

nonn

Author

R. H. Hardin, Feb 15 2014

Status

approved