A237489 Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the upper median minus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one

256, 1728, 11960, 84000, 589944, 4135648, 28986208, 203229696, 1425235712, 9994034688, 70063673600, 491213816320, 3444698036992, 24155061404672, 169341502948352, 1187245857484800, 8325697972232192, 58381830568157184

Offset

1,1

Comments

Column 1 of A237494

Links

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

Formula

Empirical: a(n) = 2568*a(n-4) -371328*a(n-8) +15212544*a(n-12) -125530112*a(n-16) +93167616*a(n-20) -143392768*a(n-24) for n>27

Example

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

Crossrefs

Sequence in context: A237936 A237931 A237494 * A238054 A238049 A237785

Adjacent sequences: A237486 A237487 A237488 * A237490 A237491 A237492

Keyword

nonn

Author

R. H. Hardin, Feb 08 2014

Status

approved