A237861 Number of (n+1)X(1+1) 0..2 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one

81, 336, 1414, 6030, 25525, 107272, 453088, 1919632, 8117752, 34231344, 144659936, 611705384, 2586040156, 10917301088, 46143495072, 194990974880, 824264967728, 3481115148416, 14714216616096, 62164050866784, 262771277795472

Offset

1,1

Comments

Column 1 of A237868

Links

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

Formula

Empirical: a(n) = 252*a(n-4) +1304*a(n-6) -1908*a(n-8) -1312*a(n-10) +1280*a(n-12) -2304*a(n-14)

Example

Some solutions for n=5
..0..2....0..1....2..2....1..0....0..1....1..2....2..0....1..1....2..2....1..2
..1..1....2..2....2..1....2..0....2..2....2..2....2..2....2..0....2..1....2..1
..1..1....1..1....0..1....1..1....2..0....0..0....1..2....2..1....1..2....0..0
..0..1....0..0....2..2....1..1....1..2....1..2....1..0....0..1....2..2....0..2
..0..2....1..0....2..0....1..0....1..0....1..2....1..0....1..0....1..1....0..1
..1..1....2..0....1..2....2..0....2..0....0..0....2..1....1..1....1..1....1..1

Crossrefs

Sequence in context: A237481 A237474 A237868 * A236902 A236895 A237965

Adjacent sequences: A237858 A237859 A237860 * A237862 A237863 A237864

Keyword

nonn

Author

R. H. Hardin, Feb 14 2014

Status

approved