A237151 Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the minimum of every 2X2 subblock equal

256, 1868, 14096, 111900, 912848, 7609244, 64386416, 550822812, 4749508432, 41185550812, 358590297584, 3131149739868, 27396633718096, 240059539178012, 2105641412259696, 18482580742827036, 162315877794530896

Offset

1,1

Comments

Column 1 of A237158

Links

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

Formula

Empirical: a(n) = 20*a(n-1) -123*a(n-2) +130*a(n-3) +1001*a(n-4) -2016*a(n-5) -2381*a(n-6) +4474*a(n-7) +2016*a(n-8) -2160*a(n-9) -960*a(n-10)

Example

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

Crossrefs

Sequence in context: A237898 A237891 A237158 * A237574 A237569 A237544

Adjacent sequences: A237148 A237149 A237150 * A237152 A237153 A237154

Keyword

nonn

Author

R. H. Hardin, Feb 04 2014

Status

approved